🔴What's normal anxiety -- and what's an anxiety disorder?
We live in a culture that doesn't take mental health issues seriously. There's a lot of stigma. Some people tell you to just suck it up, or get it together, or to stop worrying, or that it's all in your head. But I'm here to tell you that anxiety disorders, they're as real as diabetes.
Hi again. It's Dr. Jen, and I've noticed something with my patients. They often describe to me some classic symptoms of an anxiety disorder. Constant worry, trouble sleeping, tense muscles and struggle with concentrating. But they aren't getting treatment.
There's a lot of issues with mental-health care in this country. Some people don't have insurance that would cover it. Some have been dismissed or minimized in the past, and don't think seeking help will do any good. Some worry about the stigma and whether it could affect future jobs or relationships. But severe anxiety isn't a moral or personal failing. It's a health problem, just like strep throat or diabetes. It needs to be treated with the same kind of seriousness.
Before we can talk about anxiety disorders, let's talk about anxiety itself. Anxiety is the very real and normal emotion we feel in a stressful situation. It's related to fear. But while fear is a response to an immediate threat that quickly subsides, anxiety is a response to more uncertain threats that tends to last much longer. It's all part of the threat detection system, which all animals have to some degree, to help protect us from predators. Anxiety starts in the brain's amygdala, a pair of almond-sized nerve bundles that alert other areas of the brain to be ready for defensive action. Next, the hypothalamus relays the signal, setting off what we call the stress response in our body. Our muscles tense, our breathing and heart rate increase and our blood pressure rises. Areas in the brain stem kick in and put you in a state of high alertness. This is the fight-or-flight response.
There are ways the fight-or-flight response is kept somewhat in check, with an area of higher-level thinking called the ventromedial prefrontal cortex. It works like this. If a person sees something they think is dangerous, like a tiger, that sends a signal to the amygdala, saying "it's time to run." The ventromedial prefrontal cortex can say to the amygdala, "Hey, look. The tiger's in a cage. You know what a cage is? They can't escape from a cage. It's OK to calm down." It's a feedback loop that can help keep the response in check. The hippocampus is also involved. It provides context, saying things like, "Hey, we've seen tigers in cages before. We're in a zoo. You are extra safe."
With anxiety, these threat-detection systems and mechanisms that reduce or inhibit them are functioning incorrectly and cause us to worry about the future and our safety in it. But for many people, it goes into overdrive. They experience persistent pervasive anxiety that disrupts work, school and relationships and leads them to avoid situations that may trigger symptoms. Anxiety disorders are not at all uncommon. Based on data from the World Mental Health Survey, researchers estimate that about 16 percent of individuals currently have or have had an anxiety disorder. These include social anxiety disorder, panic disorder, agoraphobia and phobias. Studies have shown that people with anxiety disorders don't just have a different way of reacting to stress. There may be actual differences in how their brain is working.
One model describes possible mix-ups in the connections between the amygdala and other parts of the brain. The pathways that signal anxiety become stronger. And the more anxiety you have, the stronger the pathways become, and it becomes a vicious cycle.
We live in a culture that doesn't take mental health issues seriously. There's a lot of stigma. Some people tell you to just suck it up, or get it together, or to stop worrying, or that it's all in your head. But I'm here to tell you that anxiety disorders, they're as real as diabetes.
Hi again. It's Dr. Jen, and I've noticed something with my patients. They often describe to me some classic symptoms of an anxiety disorder. Constant worry, trouble sleeping, tense muscles and struggle with concentrating. But they aren't getting treatment.
There's a lot of issues with mental-health care in this country. Some people don't have insurance that would cover it. Some have been dismissed or minimized in the past, and don't think seeking help will do any good. Some worry about the stigma and whether it could affect future jobs or relationships. But severe anxiety isn't a moral or personal failing. It's a health problem, just like strep throat or diabetes. It needs to be treated with the same kind of seriousness.
Before we can talk about anxiety disorders, let's talk about anxiety itself. Anxiety is the very real and normal emotion we feel in a stressful situation. It's related to fear. But while fear is a response to an immediate threat that quickly subsides, anxiety is a response to more uncertain threats that tends to last much longer. It's all part of the threat detection system, which all animals have to some degree, to help protect us from predators. Anxiety starts in the brain's amygdala, a pair of almond-sized nerve bundles that alert other areas of the brain to be ready for defensive action. Next, the hypothalamus relays the signal, setting off what we call the stress response in our body. Our muscles tense, our breathing and heart rate increase and our blood pressure rises. Areas in the brain stem kick in and put you in a state of high alertness. This is the fight-or-flight response.
There are ways the fight-or-flight response is kept somewhat in check, with an area of higher-level thinking called the ventromedial prefrontal cortex. It works like this. If a person sees something they think is dangerous, like a tiger, that sends a signal to the amygdala, saying "it's time to run." The ventromedial prefrontal cortex can say to the amygdala, "Hey, look. The tiger's in a cage. You know what a cage is? They can't escape from a cage. It's OK to calm down." It's a feedback loop that can help keep the response in check. The hippocampus is also involved. It provides context, saying things like, "Hey, we've seen tigers in cages before. We're in a zoo. You are extra safe."
With anxiety, these threat-detection systems and mechanisms that reduce or inhibit them are functioning incorrectly and cause us to worry about the future and our safety in it. But for many people, it goes into overdrive. They experience persistent pervasive anxiety that disrupts work, school and relationships and leads them to avoid situations that may trigger symptoms. Anxiety disorders are not at all uncommon. Based on data from the World Mental Health Survey, researchers estimate that about 16 percent of individuals currently have or have had an anxiety disorder. These include social anxiety disorder, panic disorder, agoraphobia and phobias. Studies have shown that people with anxiety disorders don't just have a different way of reacting to stress. There may be actual differences in how their brain is working.
One model describes possible mix-ups in the connections between the amygdala and other parts of the brain. The pathways that signal anxiety become stronger. And the more anxiety you have, the stronger the pathways become, and it becomes a vicious cycle.
The good news is there's treatment for anxiety, and that you don't have to suffer. Remember, this isn't about weakness. It's about changing brain patterns, and research shows that our brains have the ability to reorganize and form new connections all throughout our lives. A good first step is to do the basics. Eat a balanced diet, exercise regularly and get plenty of sleep, as your mind is part of your body. It might also help to try meditation. Instead of our heart rate rising and our body tensing, with mindfulness and breathing, we can slow down the fight-or-flight response and improve how we feel in the moment. Cognitive behavioral therapy, a form of talk therapy, can also be fantastic. In it, you learn to identify upsetting thoughts and determine whether they're realistic. Over time, cognitive behavioral therapy can rebuild those neural pathways that tamp down the anxiety response. Medication can also give relief, in both the short-term and the long-term. In the short-term, anti-anxiety drugs can down-regulate the threat-detection mechanisms that are going into overdrive. Studies have shown that both long-term medications and cognitive behavioral therapy can reduce that overreactivity of the amygdala we see an anxiety disorders.
High blood pressure and diabetes, they can be treated or managed over time. And the same is true for an anxiety disorder too.
#Psychology #Biology #Brain #Mental_Health #Neuroscience #Human_Body
🎙Join ➣ @TEDTalksLearning ☜
🎙Join ➣ @TEDTalksLearning ☜
High blood pressure and diabetes, they can be treated or managed over time. And the same is true for an anxiety disorder too.
#Psychology #Biology #Brain #Mental_Health #Neuroscience #Human_Body
🎙Join ➣ @TEDTalksLearning ☜
🎙Join ➣ @TEDTalksLearning ☜
Media is too big
VIEW IN TELEGRAM
🔴The benefits of daydreaming
#Memory #Education #Evolution #Psychology #Brain #Decision_Making #TED_Ed #Animation #Kids
🎙Join ➣ @TEDTalksLearning ☜
🎙Join ➣ @TEDTalksLearning ☜
#Memory #Education #Evolution #Psychology #Brain #Decision_Making #TED_Ed #Animation #Kids
🎙Join ➣ @TEDTalksLearning ☜
🎙Join ➣ @TEDTalksLearning ☜
👍1
🔴The benefits of daydreaming
On a daily basis, you spend between a third and half your waking hours daydreaming. That may sound like a huge waste of time, but scientists think it must have some purpose, or humans wouldn’t have evolved to do so much of it. So to figure out what's going on here, let’s take a closer look at the mind-wanderer in chief: the bored teenager.
Wouldn’t it be cool to discover something, anything. Like even this plant. Just to be one of those explorers who sails around drawing stuff for years on end and everyone thinks they’re a genius. But does anyone even do that anymore? Is there anything left to discover? And would I be tough enough to deal with the dysentery or scurvy or piranhas or whatever? I barely have the endurance to make it through track practice... but I will. Any day now, I’ll have the discipline to show up before sunrise and practice. I’ll win all my races. Winning will become so easy, I’ll pick up other events just for fun. And once I'm in the Olympics, they’ll have no choice but to crown me team captain, which I will graciously accept. And will I be nasty to the teammate who yelled at me? No. I’ll just calmly say, “hope you’re in a better mood.”
Okay. Yours and other people's daydreams might sound or feel something like that. Let's see what was going on. To see what parts of the brain are active when you’re doing a task, or thinking, or daydreaming, scientists use brain imaging techniques that show increased blood flow and energy expenditure in those areas.
These brain areas are active, working together and communicating with each other. Taken together, they're called the executive network. When your mind starts to wander, a different set of brain areas becomes active. These areas make up the default mode network. The name default mode makes it sound like nothing is going on. And in fact, for many years, scientists associated this pattern of activity with rest. But a closer look reveals that these are the brain areas involved when we revisit a memory, when we think about our plans and hopes, and yes, when our minds are wandering off on a wild daydream. The mind can wander to unproductive or distressing places and brood over negative past events, like an argument. It can also wander to neutral, everyday matters, like planning out the rest of one's afternoon. But where mind-wandering really gets interesting is when it crosses into the realm of free-moving associative thought that you aren’t consciously directing. This kind of mind-wandering is associated with increases in both ideas and positive emotions, and the evidence suggests that daydreaming can help people envision ways to reach their goals and navigate relationships and social situations.
Scientists think there may be two essential parts to this process: a generative phase of free-flowing ideas and spontaneous thoughts, courtesy of the default mode network, followed by a process of selecting, developing, and pursuing the best ideas from that generative burst, driven by logical thinking thanks to the executive network. A host of imaging studies suggest that these two networks working in sync is a crucial condition for creative thinking. Taken together, the evidence clearly suggests the logical realm of the executive network and the imaginative realm of the default mode network are closely related. And as you can see, the executive network is still playing a role when the default mode network is doing its thing during daydreaming.
In teenagers, the prefrontal cortex and other areas involved in executive function are still developing, but teens are perfectly capable of thinking through their problems and goals, especially when given space to do so on their own.
#Memory #Education #Evolution #Psychology #Brain #Decision_Making #TED_Ed #Animation #Kids
🎙Join ➣ @TEDTalksLearning ☜
🎙Join ➣ @TEDTalksLearning ☜
On a daily basis, you spend between a third and half your waking hours daydreaming. That may sound like a huge waste of time, but scientists think it must have some purpose, or humans wouldn’t have evolved to do so much of it. So to figure out what's going on here, let’s take a closer look at the mind-wanderer in chief: the bored teenager.
Wouldn’t it be cool to discover something, anything. Like even this plant. Just to be one of those explorers who sails around drawing stuff for years on end and everyone thinks they’re a genius. But does anyone even do that anymore? Is there anything left to discover? And would I be tough enough to deal with the dysentery or scurvy or piranhas or whatever? I barely have the endurance to make it through track practice... but I will. Any day now, I’ll have the discipline to show up before sunrise and practice. I’ll win all my races. Winning will become so easy, I’ll pick up other events just for fun. And once I'm in the Olympics, they’ll have no choice but to crown me team captain, which I will graciously accept. And will I be nasty to the teammate who yelled at me? No. I’ll just calmly say, “hope you’re in a better mood.”
Okay. Yours and other people's daydreams might sound or feel something like that. Let's see what was going on. To see what parts of the brain are active when you’re doing a task, or thinking, or daydreaming, scientists use brain imaging techniques that show increased blood flow and energy expenditure in those areas.
These brain areas are active, working together and communicating with each other. Taken together, they're called the executive network. When your mind starts to wander, a different set of brain areas becomes active. These areas make up the default mode network. The name default mode makes it sound like nothing is going on. And in fact, for many years, scientists associated this pattern of activity with rest. But a closer look reveals that these are the brain areas involved when we revisit a memory, when we think about our plans and hopes, and yes, when our minds are wandering off on a wild daydream. The mind can wander to unproductive or distressing places and brood over negative past events, like an argument. It can also wander to neutral, everyday matters, like planning out the rest of one's afternoon. But where mind-wandering really gets interesting is when it crosses into the realm of free-moving associative thought that you aren’t consciously directing. This kind of mind-wandering is associated with increases in both ideas and positive emotions, and the evidence suggests that daydreaming can help people envision ways to reach their goals and navigate relationships and social situations.
Scientists think there may be two essential parts to this process: a generative phase of free-flowing ideas and spontaneous thoughts, courtesy of the default mode network, followed by a process of selecting, developing, and pursuing the best ideas from that generative burst, driven by logical thinking thanks to the executive network. A host of imaging studies suggest that these two networks working in sync is a crucial condition for creative thinking. Taken together, the evidence clearly suggests the logical realm of the executive network and the imaginative realm of the default mode network are closely related. And as you can see, the executive network is still playing a role when the default mode network is doing its thing during daydreaming.
In teenagers, the prefrontal cortex and other areas involved in executive function are still developing, but teens are perfectly capable of thinking through their problems and goals, especially when given space to do so on their own.
#Memory #Education #Evolution #Psychology #Brain #Decision_Making #TED_Ed #Animation #Kids
🎙Join ➣ @TEDTalksLearning ☜
🎙Join ➣ @TEDTalksLearning ☜
Media is too big
VIEW IN TELEGRAM
🔴The affordable, 3D-printed bionics of the future
#Technology #Design #Invention #Innovation #Health #Prosthetics #TED_Fellows #3D_Printing
🎙Join ➣ @TEDTalksLearning ☜
🎙Join ➣ @TEDTalksLearning ☜
#Technology #Design #Invention #Innovation #Health #Prosthetics #TED_Fellows #3D_Printing
🎙Join ➣ @TEDTalksLearning ☜
🎙Join ➣ @TEDTalksLearning ☜
🔴The affordable, 3D-printed bionics of the future
One in seven people around the world has some kind of disability. Being born without my right hand has defined who I am over the past 30 years. I was fortunate to grow [up] in the sacred valley of the Incas in Cusco, Peru, surrounded by people who weren't surprised to see me driving my bike or probably playing basketball. When I was seven, I remember being stunned after I watched "Star Wars: The Empire Strikes Back," when Luke's hand gets cut off, the same one I didn't have. But then, being twice as stunned when the medical robots fitted him with a prosthesis that could move and feel. From then on, no greater purpose lived in my mind, which was to have a prosthesis like Luke Skywalker.
This dream led me to study mechatronics engineering and access the Biomechanics and Applied Robotics Laboratory in Pontifical Catholic University of Peru, where, with a multidisciplinary team, we developed a myoelectric prosthesis for a long transradial amputation, being me, the pilot user. I was able to move each finger individually. And also we developed a way in which we get to pass the sensation from the fingertips into my forearm using haptic feedback system.
Since this was a research project, we had enough funding to buy stuff from abroad. So, for example, the motors you get to see here, were all brought [from] Switzerland. This is one of the main reasons why it will cost at least 40,000 dollars to make this prosthesis. But 40K is way too much, considering that four out of five people with upper limb amputation live in developing countries. Even the 25,000 dollars that cost a robotic prosthesis imported from abroad is way too much. In Peru, that is equivalent to work full time on a minimum wage for almost seven years, just to buy the prostheses. Never mind pay for your food or your house. It is often that people get injured while doing manual labor activities like farming or metal manufacturing. Getting back to work and having access to money demands a functional hand.
It took me time to realize what a huge privilege I had to study a career that would help fulfill my dreams. But actually, what was preventing me from developing a solution that was both affordable and functional. The very first step in order to reducing the cost was to reduce the number of motors because they were all imported and therefore expensive. So we get to arrange occupational focus groups with our amputee volunteers in order to identify which gestures they will use the most, and of those, how many we could perform using just a single motor. The answer was three: pinch, cylindrical and lateral. This also helps us to reduce the number of electromyography sensors, too, from an arrangement of eight, we passed just to one. In this way, between makes in mechanical and myoelectric prosthesis, the prices will be dramatically low.
But material prices matter to. And that's why we choose to 3D print our prosthesis using mainly plastic from recycled bottles. Like the prosthesis I am wearing right now.
In order to develop our prosthesis, the process will go like this. First, we'll use our 3D scan and our own parametrization software in order to take the measures of the amputated area and the other hand of the user. Then we'll recreate the entire set of fingers, the palm and the prosthesis socket in our computational model to finally 3D print each of those parts. So far in LAT Bionics, we have two types of prosthesis. Maki, which is a mechanical activation and Pisko, with electronic activation. Pisko cost just 10 percent of an imported robotic prosthesis that will come from abroad. This means that even more working-class people can access our technology. For me, this has been a path where I was able to develop this in my company LAT Bionics. So, for example, take Franco, [who] now is using his transradial Maki prostheses in order to get back to work with his providers on the jungle farm he has.
One in seven people around the world has some kind of disability. Being born without my right hand has defined who I am over the past 30 years. I was fortunate to grow [up] in the sacred valley of the Incas in Cusco, Peru, surrounded by people who weren't surprised to see me driving my bike or probably playing basketball. When I was seven, I remember being stunned after I watched "Star Wars: The Empire Strikes Back," when Luke's hand gets cut off, the same one I didn't have. But then, being twice as stunned when the medical robots fitted him with a prosthesis that could move and feel. From then on, no greater purpose lived in my mind, which was to have a prosthesis like Luke Skywalker.
This dream led me to study mechatronics engineering and access the Biomechanics and Applied Robotics Laboratory in Pontifical Catholic University of Peru, where, with a multidisciplinary team, we developed a myoelectric prosthesis for a long transradial amputation, being me, the pilot user. I was able to move each finger individually. And also we developed a way in which we get to pass the sensation from the fingertips into my forearm using haptic feedback system.
Since this was a research project, we had enough funding to buy stuff from abroad. So, for example, the motors you get to see here, were all brought [from] Switzerland. This is one of the main reasons why it will cost at least 40,000 dollars to make this prosthesis. But 40K is way too much, considering that four out of five people with upper limb amputation live in developing countries. Even the 25,000 dollars that cost a robotic prosthesis imported from abroad is way too much. In Peru, that is equivalent to work full time on a minimum wage for almost seven years, just to buy the prostheses. Never mind pay for your food or your house. It is often that people get injured while doing manual labor activities like farming or metal manufacturing. Getting back to work and having access to money demands a functional hand.
It took me time to realize what a huge privilege I had to study a career that would help fulfill my dreams. But actually, what was preventing me from developing a solution that was both affordable and functional. The very first step in order to reducing the cost was to reduce the number of motors because they were all imported and therefore expensive. So we get to arrange occupational focus groups with our amputee volunteers in order to identify which gestures they will use the most, and of those, how many we could perform using just a single motor. The answer was three: pinch, cylindrical and lateral. This also helps us to reduce the number of electromyography sensors, too, from an arrangement of eight, we passed just to one. In this way, between makes in mechanical and myoelectric prosthesis, the prices will be dramatically low.
But material prices matter to. And that's why we choose to 3D print our prosthesis using mainly plastic from recycled bottles. Like the prosthesis I am wearing right now.
In order to develop our prosthesis, the process will go like this. First, we'll use our 3D scan and our own parametrization software in order to take the measures of the amputated area and the other hand of the user. Then we'll recreate the entire set of fingers, the palm and the prosthesis socket in our computational model to finally 3D print each of those parts. So far in LAT Bionics, we have two types of prosthesis. Maki, which is a mechanical activation and Pisko, with electronic activation. Pisko cost just 10 percent of an imported robotic prosthesis that will come from abroad. This means that even more working-class people can access our technology. For me, this has been a path where I was able to develop this in my company LAT Bionics. So, for example, take Franco, [who] now is using his transradial Maki prostheses in order to get back to work with his providers on the jungle farm he has.
I am certain that we are able to be on the side with technology that is brought from abroad to our region being sold in a very expensive way. We have the capacity to develop our own technology, having the necessities of our people in mind. So then people with disabilities and limited resources could live a life again. For me, when people, our users, get back to work on their places, that look of compassion changed to astonishment. The same astonishment which I had when I saw Luke Skywalker prosthesis.
So this began as a path for myself, but it now belongs to my entire region. Would you like to join us?
Thank you so much.
#Technology #Design #Invention #Innovation #Health #Prosthetics #TED_Fellows #3D_Printing
🎙Join ➣ @TEDTalksLearning ☜
🎙Join ➣ @TEDTalksLearning ☜
So this began as a path for myself, but it now belongs to my entire region. Would you like to join us?
Thank you so much.
#Technology #Design #Invention #Innovation #Health #Prosthetics #TED_Fellows #3D_Printing
🎙Join ➣ @TEDTalksLearning ☜
🎙Join ➣ @TEDTalksLearning ☜
Media is too big
VIEW IN TELEGRAM
🔴The myth of Pegasus and the chimera
#Education #Storytelling #Ancient_World #TED_Ed #Animation
🎙Join ➣ @TEDTalksLearning ☜
🎙Join ➣ @TEDTalksLearning ☜
#Education #Storytelling #Ancient_World #TED_Ed #Animation
🎙Join ➣ @TEDTalksLearning ☜
🎙Join ➣ @TEDTalksLearning ☜
🔴The myth of Pegasus and the chimera
Shielded from the gorgon’s stone-cold gaze, Perseus crept through Medusa’s cave. When he reached her, he took a deep breath, and in one sudden movement, drew his sickle and brought it down on her neck. Medusa’s head rolled to the ground and from her neck sprung two children.
One of them was Chrysaor, a giant wielding a golden sword; The other was the magnificent, white, winged horse, Pegasus. He was swifter than any other steed, and with the stomp of his hooves, he could alter mountains and draw streams from dry rock. No bridle could contain him— until one fateful day.
Bellerophon, prince of the Greek city-state of Corinth, seemed to have it all. But his ambitions exceeded his earthly circumstances. What he truly wanted was to be a hero so great that the gods would welcome him on Mount Olympus. Bellerophon believed that Pegasus would be key in helping him reach such heights.
One night, he visited the temple of Athena, the goddess of war and wisdom, and prayed for the power to appease the mighty animal. When Bellerophon woke, he found a magical golden bridle, and sped to the fountain that Pegasus drank from. As soon as the horse bent towards the water, Bellerophon jumped on his back and slipped the bridle on. Finally, Pegasus was subdued. With this conquest, Bellerophon felt that he was on his way to becoming a legendary hero. He trained for battle day and night. But one training session went horribly wrong, and Bellerophon mortally injured his brother, Deliades.
Disgraced, he was exiled to Argos, where King Proetus purified him. Bellerophon was resolved to repair his reputation, but the Queen of Argos had her eye on him. And when Bellerophon rebuffed her advances, she accused him of trying to seduce her, further tarnishing his honor.
King Proetus soon devised a plan to exact revenge. He banished Bellerophon and Pegasus and sent them to the kingdom of Lycia, carrying a note to Iobates, Lycia’s king. But unbeknownst to Bellerophon, he was carrying a decree for his own death. Iobates considered how to dispose of the youth and picked just the right monster for the job: the fire-breathing lion-goat-dragon Chimera that had long been terrorizing his kingdom. Bellerophon— eager to achieve greatness— jumped at the challenge.
He mounted Pegasus, and the two shot into the sky. Swooping above the earth, they saw the Chimera surrounded by its charred victims. Soon, they too were facing its firepower. In a sequence of agile aerial acrobatics, Pegasus dodged every blast from the Chimera as Bellerophon launched his arrows. Finally, Pegasus closed in on the beast at just the right angle, and Bellerophon dealt it a deadly blow.
Iobates was incredulous. He was glad to be rid of the monster, but still needed to deal with Bellerophon. So, he set forth more challenges, putting Bellerophon up against fearsome warriors, highly skilled archers, and, ultimately, Lycia’s best soldiers. Every time, Pegasus’ power turned the tide in Bellerophon’s favor.
Finally, Iobates had no choice but to concede that Bellerophon was a true hero. He even offered him his daughter’s hand in marriage. But Bellerophon’s sights were set far beyond the land of mortals. He was certain he must now be entitled to a place on Mount Olympus. So, he jumped onto Pegasus and urged him higher and higher.
Zeus watched as Bellerophon, buoyed by hubris, neared his palace. To punish the youth, he released a single gadfly, which beelined towards Pegasus and bit into his flesh. This was as high as Bellerophon would ever get. As Pegasus flinched, he flung his rider into the air, and Bellerophon fell careening back to Earth.
Pegasus, on the other hand, ascended with Zeus’s blessing. The gods welcomed him into the halls of Mount Olympus and immortalized him in a constellation. There in the night sky, Pegasus can be seen soaring, unfettered and free.
#Education #Storytelling #Ancient_World #TED_Ed #Animation
🎙Join ➣ @TEDTalksLearning ☜
🎙Join ➣ @TEDTalksLearning ☜
Shielded from the gorgon’s stone-cold gaze, Perseus crept through Medusa’s cave. When he reached her, he took a deep breath, and in one sudden movement, drew his sickle and brought it down on her neck. Medusa’s head rolled to the ground and from her neck sprung two children.
One of them was Chrysaor, a giant wielding a golden sword; The other was the magnificent, white, winged horse, Pegasus. He was swifter than any other steed, and with the stomp of his hooves, he could alter mountains and draw streams from dry rock. No bridle could contain him— until one fateful day.
Bellerophon, prince of the Greek city-state of Corinth, seemed to have it all. But his ambitions exceeded his earthly circumstances. What he truly wanted was to be a hero so great that the gods would welcome him on Mount Olympus. Bellerophon believed that Pegasus would be key in helping him reach such heights.
One night, he visited the temple of Athena, the goddess of war and wisdom, and prayed for the power to appease the mighty animal. When Bellerophon woke, he found a magical golden bridle, and sped to the fountain that Pegasus drank from. As soon as the horse bent towards the water, Bellerophon jumped on his back and slipped the bridle on. Finally, Pegasus was subdued. With this conquest, Bellerophon felt that he was on his way to becoming a legendary hero. He trained for battle day and night. But one training session went horribly wrong, and Bellerophon mortally injured his brother, Deliades.
Disgraced, he was exiled to Argos, where King Proetus purified him. Bellerophon was resolved to repair his reputation, but the Queen of Argos had her eye on him. And when Bellerophon rebuffed her advances, she accused him of trying to seduce her, further tarnishing his honor.
King Proetus soon devised a plan to exact revenge. He banished Bellerophon and Pegasus and sent them to the kingdom of Lycia, carrying a note to Iobates, Lycia’s king. But unbeknownst to Bellerophon, he was carrying a decree for his own death. Iobates considered how to dispose of the youth and picked just the right monster for the job: the fire-breathing lion-goat-dragon Chimera that had long been terrorizing his kingdom. Bellerophon— eager to achieve greatness— jumped at the challenge.
He mounted Pegasus, and the two shot into the sky. Swooping above the earth, they saw the Chimera surrounded by its charred victims. Soon, they too were facing its firepower. In a sequence of agile aerial acrobatics, Pegasus dodged every blast from the Chimera as Bellerophon launched his arrows. Finally, Pegasus closed in on the beast at just the right angle, and Bellerophon dealt it a deadly blow.
Iobates was incredulous. He was glad to be rid of the monster, but still needed to deal with Bellerophon. So, he set forth more challenges, putting Bellerophon up against fearsome warriors, highly skilled archers, and, ultimately, Lycia’s best soldiers. Every time, Pegasus’ power turned the tide in Bellerophon’s favor.
Finally, Iobates had no choice but to concede that Bellerophon was a true hero. He even offered him his daughter’s hand in marriage. But Bellerophon’s sights were set far beyond the land of mortals. He was certain he must now be entitled to a place on Mount Olympus. So, he jumped onto Pegasus and urged him higher and higher.
Zeus watched as Bellerophon, buoyed by hubris, neared his palace. To punish the youth, he released a single gadfly, which beelined towards Pegasus and bit into his flesh. This was as high as Bellerophon would ever get. As Pegasus flinched, he flung his rider into the air, and Bellerophon fell careening back to Earth.
Pegasus, on the other hand, ascended with Zeus’s blessing. The gods welcomed him into the halls of Mount Olympus and immortalized him in a constellation. There in the night sky, Pegasus can be seen soaring, unfettered and free.
#Education #Storytelling #Ancient_World #TED_Ed #Animation
🎙Join ➣ @TEDTalksLearning ☜
🎙Join ➣ @TEDTalksLearning ☜
🔴🔴پکیج رایگان نکات کاربردی گرامر سطح مبتدی برای داوطلبین کلیه آزمونهای بین المللی سنجش زبان در لینک زیر
👇👇
https://b2n.ir/s01910
Join ➣ @BestIELTS ☜عضويت
www.bestielts.ir
👇👇
https://b2n.ir/s01910
Join ➣ @BestIELTS ☜عضويت
www.bestielts.ir
Media is too big
VIEW IN TELEGRAM
🔴The danger of silence
#Social_Change #Poetry #Spoken_Word
🎙Join ➣ @TEDTalksLearning ☜
🎙Join ➣ @TEDTalksLearning ☜
#Social_Change #Poetry #Spoken_Word
🎙Join ➣ @TEDTalksLearning ☜
🎙Join ➣ @TEDTalksLearning ☜
👍2
🔴The danger of silence
Dr. Martin Luther King, Jr., in a 1968 speech where he reflects upon the Civil Rights Movement, states, "In the end, we will remember not the words of our enemies but the silence of our friends."
As a teacher, I've internalized this message. Every day, all around us, we see the consequences of silence manifest themselves in the form of discrimination, violence, genocide and war. In the classroom, I challenge my students to explore the silences in their own lives through poetry. We work together to fill those spaces, to recognize them, to name them, to understand that they don't have to be sources of shame. In an effort to create a culture within my classroom where students feel safe sharing the intimacies of their own silences, I have four core principles posted on the board that sits in the front of my class, which every student signs at the beginning of the year: read critically, write consciously, speak clearly, tell your truth.
And I find myself thinking a lot about that last point, tell your truth. And I realized that if I was going to ask my students to speak up, I was going to have to tell my truth and be honest with them about the times where I failed to do so.
So I tell them that growing up, as a kid in a Catholic family in New Orleans, during Lent I was always taught that the most meaningful thing one could do was to give something up, sacrifice something you typically indulge in to prove to God you understand his sanctity. I've given up soda, McDonald's, French fries, French kisses, and everything in between. But one year, I gave up speaking. I figured the most valuable thing I could sacrifice was my own voice, but it was like I hadn't realized that I had given that up a long time ago. I spent so much of my life telling people the things they wanted to hear instead of the things they needed to, told myself I wasn't meant to be anyone's conscience because I still had to figure out being my own, so sometimes I just wouldn't say anything, appeasing ignorance with my silence, unaware that validation doesn't need words to endorse its existence. When Christian was beat up for being gay, I put my hands in my pocket and walked with my head down as if I didn't even notice. I couldn't use my locker for weeks because the bolt on the lock reminded me of the one I had put on my lips when the homeless man on the corner looked at me with eyes up merely searching for an affirmation that he was worth seeing. I was more concerned with touching the screen on my Apple than actually feeding him one. When the woman at the fundraising gala said "I'm so proud of you. It must be so hard teaching those poor, unintelligent kids," I bit my lip, because apparently we needed her money more than my students needed their dignity.
We spend so much time listening to the things people are saying that we rarely pay attention to the things they don't. Silence is the residue of fear. It is feeling your flaws gut-wrench guillotine your tongue. It is the air retreating from your chest because it doesn't feel safe in your lungs. Silence is Rwandan genocide. Silence is Katrina. It is what you hear when there aren't enough body bags left. It is the sound after the noose is already tied. It is charring. It is chains. It is privilege. It is pain. There is no time to pick your battles when your battles have already picked you.
Dr. Martin Luther King, Jr., in a 1968 speech where he reflects upon the Civil Rights Movement, states, "In the end, we will remember not the words of our enemies but the silence of our friends."
As a teacher, I've internalized this message. Every day, all around us, we see the consequences of silence manifest themselves in the form of discrimination, violence, genocide and war. In the classroom, I challenge my students to explore the silences in their own lives through poetry. We work together to fill those spaces, to recognize them, to name them, to understand that they don't have to be sources of shame. In an effort to create a culture within my classroom where students feel safe sharing the intimacies of their own silences, I have four core principles posted on the board that sits in the front of my class, which every student signs at the beginning of the year: read critically, write consciously, speak clearly, tell your truth.
And I find myself thinking a lot about that last point, tell your truth. And I realized that if I was going to ask my students to speak up, I was going to have to tell my truth and be honest with them about the times where I failed to do so.
So I tell them that growing up, as a kid in a Catholic family in New Orleans, during Lent I was always taught that the most meaningful thing one could do was to give something up, sacrifice something you typically indulge in to prove to God you understand his sanctity. I've given up soda, McDonald's, French fries, French kisses, and everything in between. But one year, I gave up speaking. I figured the most valuable thing I could sacrifice was my own voice, but it was like I hadn't realized that I had given that up a long time ago. I spent so much of my life telling people the things they wanted to hear instead of the things they needed to, told myself I wasn't meant to be anyone's conscience because I still had to figure out being my own, so sometimes I just wouldn't say anything, appeasing ignorance with my silence, unaware that validation doesn't need words to endorse its existence. When Christian was beat up for being gay, I put my hands in my pocket and walked with my head down as if I didn't even notice. I couldn't use my locker for weeks because the bolt on the lock reminded me of the one I had put on my lips when the homeless man on the corner looked at me with eyes up merely searching for an affirmation that he was worth seeing. I was more concerned with touching the screen on my Apple than actually feeding him one. When the woman at the fundraising gala said "I'm so proud of you. It must be so hard teaching those poor, unintelligent kids," I bit my lip, because apparently we needed her money more than my students needed their dignity.
We spend so much time listening to the things people are saying that we rarely pay attention to the things they don't. Silence is the residue of fear. It is feeling your flaws gut-wrench guillotine your tongue. It is the air retreating from your chest because it doesn't feel safe in your lungs. Silence is Rwandan genocide. Silence is Katrina. It is what you hear when there aren't enough body bags left. It is the sound after the noose is already tied. It is charring. It is chains. It is privilege. It is pain. There is no time to pick your battles when your battles have already picked you.
👍2
I will not let silence wrap itself around my indecision. I will tell Christian that he is a lion, a sanctuary of bravery and brilliance. I will ask that homeless man what his name is and how his day was, because sometimes all people want to be is human. I will tell that woman that my students can talk about transcendentalism like their last name was Thoreau, and just because you watched one episode of "The Wire" doesn't mean you know anything about my kids. So this year, instead of giving something up, I will live every day as if there were a microphone tucked under my tongue, a stage on the underside of my inhibition. Because who has to have a soapbox when all you've ever needed is your voice?
Thank you.
#Social_Change #Poetry #Spoken_Word
🎙Join ➣ @TEDTalksLearning ☜
🎙Join ➣ @TEDTalksLearning ☜
Thank you.
#Social_Change #Poetry #Spoken_Word
🎙Join ➣ @TEDTalksLearning ☜
🎙Join ➣ @TEDTalksLearning ☜
🤩1
🔴معرفی آزمون تافل هوم ادیشن، نحوه برگزاری آزمون و ویژگی های آن در لینک زیر
👇👇
https://b2n.ir/r76657
Join ➣ @BestIELTS ☜عضويت
www.bestielts.ir
👇👇
https://b2n.ir/r76657
Join ➣ @BestIELTS ☜عضويت
www.bestielts.ir
🔴انجام تست کوتاه سنجش گرامر از طریق لینک زیر
👇👇
https://bestielts.ir/grammar-quiz/
Join ➣ @BestIELTS ☜عضويت
www.bestielts.ir
👇👇
https://bestielts.ir/grammar-quiz/
Join ➣ @BestIELTS ☜عضويت
www.bestielts.ir
This media is not supported in your browser
VIEW IN TELEGRAM
🔴Can you solve the prisoner hat riddle?
#collaboration #memory #creativity #philosophy #TED_Ed #animation
🎙Join ➣ @TEDTalksLearning ☜
🎙Join ➣ @TEDTalksLearning ☜
#collaboration #memory #creativity #philosophy #TED_Ed #animation
🎙Join ➣ @TEDTalksLearning ☜
🎙Join ➣ @TEDTalksLearning ☜
👍1
🔴Can you solve the prisoner hat riddle?
You and nine other individuals have been captured by super intelligent alien overlords. The aliens think humans look quite tasty, but their civilization forbids eating highly logical and cooperative beings. Unfortunately, they're not sure whether you qualify, so they decide to give you all a test. Through its universal translator, the alien guarding you tells you the following: You will be placed in a single-file line facing forward in size order so that each of you can see everyone lined up ahead of you. You will not be able to look behind you or step out of line. Each of you will have either a black or a white hat on your head assigned randomly, and I won't tell you how many of each color there are. When I say to begin, each of you must guess the color of your hat starting with the person in the back and moving up the line. And don't even try saying words other than black or white or signaling some other way, like intonation or volume; you'll all be eaten immediately. If at least nine of you guess correctly, you'll all be spared. You have five minutes to discuss and come up with a plan, and then I'll line you up, assign your hats, and we'll begin. Can you think of a strategy guaranteed to save everyone? Pause the video now to figure it out for yourself. Answer in: 3 Answer in: 2 Answer in: 1 The key is that the person at the back of the line who can see everyone else's hats can use the words "black" or "white" to communicate some coded information. So what meaning can be assigned to those words that will allow everyone else to deduce their hat colors? It can't be the total number of black or white hats. There are more than two possible values, but what does have two possible values is that number's parity, that is whether it's odd or even. So the solution is to agree that whoever goes first will, for example, say "black" if he sees an odd number of black hats and "white" if he sees an even number of black hats. Let's see how it would play out if the hats were distributed like this. The tallest captive sees three black hats in front of him, so he says "black," telling everyone else he sees an odd number of black hats. He gets his own hat color wrong, but that's okay since you're collectively allowed to have one wrong answer. Prisoner two also sees an odd number of black hats, so she knows hers is white, and answers correctly. Prisoner three sees an even number of black hats, so he knows that his must be one of the black hats the first two prisoners saw. Prisoner four hears that and knows that she should be looking for an even number of black hats since one was behind her. But she only sees one, so she deduces that her hat is also black. Prisoners five through nine are each looking for an odd number of black hats, which they see, so they figure out that their hats are white. Now it all comes down to you at the front of the line. If the ninth prisoner saw an odd number of black hats, that can only mean one thing. You'll find that this strategy works for any possible arrangement of the hats. The first prisoner has a 50% chance of giving a wrong answer about his own hat, but the parity information he conveys allows everyone else to guess theirs with absolute certainty. Each begins by expecting to see an odd or even number of hats of the specified color. If what they count doesn't match, that means their own hat is that color. And everytime this happens, the next person in line will switch the parity they expect to see. So that's it, you're free to go. It looks like these aliens will have to go hungry, or find some less logical organisms to abduct.
#collaboration #memory #creativity #philosophy #TED_Ed #animation
🎙Join ➣ @TEDTalksLearning ☜
🎙Join ➣ @TEDTalksLearning ☜
You and nine other individuals have been captured by super intelligent alien overlords. The aliens think humans look quite tasty, but their civilization forbids eating highly logical and cooperative beings. Unfortunately, they're not sure whether you qualify, so they decide to give you all a test. Through its universal translator, the alien guarding you tells you the following: You will be placed in a single-file line facing forward in size order so that each of you can see everyone lined up ahead of you. You will not be able to look behind you or step out of line. Each of you will have either a black or a white hat on your head assigned randomly, and I won't tell you how many of each color there are. When I say to begin, each of you must guess the color of your hat starting with the person in the back and moving up the line. And don't even try saying words other than black or white or signaling some other way, like intonation or volume; you'll all be eaten immediately. If at least nine of you guess correctly, you'll all be spared. You have five minutes to discuss and come up with a plan, and then I'll line you up, assign your hats, and we'll begin. Can you think of a strategy guaranteed to save everyone? Pause the video now to figure it out for yourself. Answer in: 3 Answer in: 2 Answer in: 1 The key is that the person at the back of the line who can see everyone else's hats can use the words "black" or "white" to communicate some coded information. So what meaning can be assigned to those words that will allow everyone else to deduce their hat colors? It can't be the total number of black or white hats. There are more than two possible values, but what does have two possible values is that number's parity, that is whether it's odd or even. So the solution is to agree that whoever goes first will, for example, say "black" if he sees an odd number of black hats and "white" if he sees an even number of black hats. Let's see how it would play out if the hats were distributed like this. The tallest captive sees three black hats in front of him, so he says "black," telling everyone else he sees an odd number of black hats. He gets his own hat color wrong, but that's okay since you're collectively allowed to have one wrong answer. Prisoner two also sees an odd number of black hats, so she knows hers is white, and answers correctly. Prisoner three sees an even number of black hats, so he knows that his must be one of the black hats the first two prisoners saw. Prisoner four hears that and knows that she should be looking for an even number of black hats since one was behind her. But she only sees one, so she deduces that her hat is also black. Prisoners five through nine are each looking for an odd number of black hats, which they see, so they figure out that their hats are white. Now it all comes down to you at the front of the line. If the ninth prisoner saw an odd number of black hats, that can only mean one thing. You'll find that this strategy works for any possible arrangement of the hats. The first prisoner has a 50% chance of giving a wrong answer about his own hat, but the parity information he conveys allows everyone else to guess theirs with absolute certainty. Each begins by expecting to see an odd or even number of hats of the specified color. If what they count doesn't match, that means their own hat is that color. And everytime this happens, the next person in line will switch the parity they expect to see. So that's it, you're free to go. It looks like these aliens will have to go hungry, or find some less logical organisms to abduct.
#collaboration #memory #creativity #philosophy #TED_Ed #animation
🎙Join ➣ @TEDTalksLearning ☜
🎙Join ➣ @TEDTalksLearning ☜
Media is too big
VIEW IN TELEGRAM
🔴What does the world's largest machine do?
#Education #Energy #TED_Ed #Natural_Resources #Animation #Electricity #Renewable_Energy
🎙Join ➣ @TEDTalksLearning ☜
🎙Join ➣ @TEDTalksLearning ☜
#Education #Energy #TED_Ed #Natural_Resources #Animation #Electricity #Renewable_Energy
🎙Join ➣ @TEDTalksLearning ☜
🎙Join ➣ @TEDTalksLearning ☜
🔴What does the world's largest machine do?
On February 7th, 1967, Homer Loutzenheuser flipped a switch in Nebraska and realized a dream more than five decades in the making. The power grids of the United States joined together, forming one interconnected machine stretching coast to coast. Today, the US power grid is the world's largest machine. It contains more than 7,300 electricity-generating plants, linked by some 11 million kilometers of powerlines, transformers and substations.
Power grids span Earth’s continents, transmitting electricity around the clock. They’re massive feats of engineering— but their functioning depends on a delicate balance. Their components must always work in unison, maintain a constant frequency throughout the grid, and match energy supply with demand. If there's too much electricity in the system, you get unsafe power spikes that can overheat and damage equipment. Too little electricity and you get blackouts.
So, to strike this balance, power grid operators monitor the grid from sophisticated control centers. They forecast energy demand and adjust which power plants are active, signaling them to turn their output up or down to precisely meet current demand.
By considering factors like the availability and cost of energy resources, grid operators create a “dispatch curve,” which maps out the order in which energy sources will be used. The grid defaults to using energy from the start of the curve first. Usually, the resources are ordered by price. Those at the start tend to be renewables because they have much lower production costs. Some grids, like those in Iceland and Costa Rica, run on more than 98% clean energy. But most dispatch curves contain more of a mix of carbon-free and carbon-emitting energy sources. This means that where your electricity is coming from— and how clean it is— varies throughout the day— as often as every few minutes.
Take the state of Kansas. Despite having plentiful wind resources, it regularly relies on carbon-emitting power plants. This is because wind energy is especially plentiful at night. But, this is also when there’s lower demand. So, Kansas’ is wind energy is actually regularly disposed of to prevent excess electricity from damaging the grid. And comparable scenarios add up to a big problem worldwide. Thankfully, dependence on renewables is rising. But power grids are often unable to make full use of them.
Many simply weren't designed around intermittent energy sources and can't store large amounts of electricity. Researchers are experimenting with unique storage solutions. However, this will take time and substantial investment. But hope is not lost. We have the opportunity to work with our existing power grids in a new way: by shifting some of our energy use to the times when there’s clean electricity to spare. Leaning into this concept, called “load flexibility,” we can help flatten the peaks in demand, which will place less stress on the grid and reduce the need for non-renewables.
So researchers are developing automated emissions reduction technologies that tap into energy use data and ensure that devices get electricity from the grid at the cleanest times. In fact, smart devices like this already exist. So, how big an effect could they have? If smart technologies like air conditioners, water heaters, and electric vehicle chargers were implemented across the Texas power grid, the state’s emissions could decrease by around 20%. In other words, simply coordinating when certain devices tap into the grid could translate to 6 million fewer tons of carbon released into the atmosphere annually from Texas alone. Now, imagine what this could look like on a global scale.
#Education #Energy #TED_Ed #Natural_Resources #Animation #Electricity #Renewable_Energy
🎙Join ➣ @TEDTalksLearning ☜
🎙Join ➣ @TEDTalksLearning ☜
On February 7th, 1967, Homer Loutzenheuser flipped a switch in Nebraska and realized a dream more than five decades in the making. The power grids of the United States joined together, forming one interconnected machine stretching coast to coast. Today, the US power grid is the world's largest machine. It contains more than 7,300 electricity-generating plants, linked by some 11 million kilometers of powerlines, transformers and substations.
Power grids span Earth’s continents, transmitting electricity around the clock. They’re massive feats of engineering— but their functioning depends on a delicate balance. Their components must always work in unison, maintain a constant frequency throughout the grid, and match energy supply with demand. If there's too much electricity in the system, you get unsafe power spikes that can overheat and damage equipment. Too little electricity and you get blackouts.
So, to strike this balance, power grid operators monitor the grid from sophisticated control centers. They forecast energy demand and adjust which power plants are active, signaling them to turn their output up or down to precisely meet current demand.
By considering factors like the availability and cost of energy resources, grid operators create a “dispatch curve,” which maps out the order in which energy sources will be used. The grid defaults to using energy from the start of the curve first. Usually, the resources are ordered by price. Those at the start tend to be renewables because they have much lower production costs. Some grids, like those in Iceland and Costa Rica, run on more than 98% clean energy. But most dispatch curves contain more of a mix of carbon-free and carbon-emitting energy sources. This means that where your electricity is coming from— and how clean it is— varies throughout the day— as often as every few minutes.
Take the state of Kansas. Despite having plentiful wind resources, it regularly relies on carbon-emitting power plants. This is because wind energy is especially plentiful at night. But, this is also when there’s lower demand. So, Kansas’ is wind energy is actually regularly disposed of to prevent excess electricity from damaging the grid. And comparable scenarios add up to a big problem worldwide. Thankfully, dependence on renewables is rising. But power grids are often unable to make full use of them.
Many simply weren't designed around intermittent energy sources and can't store large amounts of electricity. Researchers are experimenting with unique storage solutions. However, this will take time and substantial investment. But hope is not lost. We have the opportunity to work with our existing power grids in a new way: by shifting some of our energy use to the times when there’s clean electricity to spare. Leaning into this concept, called “load flexibility,” we can help flatten the peaks in demand, which will place less stress on the grid and reduce the need for non-renewables.
So researchers are developing automated emissions reduction technologies that tap into energy use data and ensure that devices get electricity from the grid at the cleanest times. In fact, smart devices like this already exist. So, how big an effect could they have? If smart technologies like air conditioners, water heaters, and electric vehicle chargers were implemented across the Texas power grid, the state’s emissions could decrease by around 20%. In other words, simply coordinating when certain devices tap into the grid could translate to 6 million fewer tons of carbon released into the atmosphere annually from Texas alone. Now, imagine what this could look like on a global scale.
#Education #Energy #TED_Ed #Natural_Resources #Animation #Electricity #Renewable_Energy
🎙Join ➣ @TEDTalksLearning ☜
🎙Join ➣ @TEDTalksLearning ☜
💥مجموعه ای از تست های رایگان تعیین سطح زبان ویژه متقاضیان آیلتس، تافل در کلیه سطوح تنها در ۲۰ دقیقه در بخش های گرامر، واژگان، ریدینگ و کالوکیشن در لینک زیر
👇👇
https://b2n.ir/d52475
Join ➣ @BestIELTS ☜عضويت
www.bestielts.ir
👇👇
https://b2n.ir/d52475
Join ➣ @BestIELTS ☜عضويت
www.bestielts.ir
This media is not supported in your browser
VIEW IN TELEGRAM
🔴The 4 greatest threats to the survival of humanity
#Climate_Change #Science #Technology #Biotech #Education #Future #Humanity #Pandemic #TED_Ed #Animation
🎙Join ➣ @TEDTalksLearning ☜
🎙Join ➣ @TEDTalksLearning ☜
#Climate_Change #Science #Technology #Biotech #Education #Future #Humanity #Pandemic #TED_Ed #Animation
🎙Join ➣ @TEDTalksLearning ☜
🎙Join ➣ @TEDTalksLearning ☜