The very first prototype of a medical mask can be considered the mask of the "plague doctor". Hundreds of years ago, it was believed that this form helps to avoid infection.

The beak of this product was filled with various medical herbs. Doctors of that time believed that the air was "purified” by passing through herbs
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Stone crushing mechanism
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India to become the world's most populous country

India's population is expected to reach 1,425,775,850 people by the end of April, surpassing China's population. The UN Population Fund predicts that India will have 2.9 million more people than China by the middle of 2023. China's birth rate has plunged recently, and its population is expected to drop below 1 billion before the end of the century.

What are the implications of India becoming the world's most populous country?

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Tornado forms around a car in seconds
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St. Edmund, king of East Anglia, met his death in 869 during the invasion of the pagan Danish armies into Britain. According to tradition, he refused the Danes’ demand that he renounce Christ. The Danes beat him, shot him with arrows and then beheaded him. St. Edmund was the patron saint of England 🏴󠁧󠁢󠁥󠁮󠁧󠁿 until replaced by St. George in the Middle Ages.
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Piracy in the 21st century
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The leaf produces oxygen in real time.

Little bubbles of O2 appear one by one due to photosynthesis.

The transition from black and white to color in Peter Jackson's WW1 documentary film They Shall Not Grow Old
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Dubai
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A classic center of mass example that shows that even the most unusual structure can be balanced.
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How the bakery works from the inside
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