This olive tree lived through the Iliad writing, the golden age of Athens, the rise of the Roman Empire and the birth of Christ, and then lived for 2,000 years after that. It is thought to be about 2,900 years old. Crete, Greece.

#General_knowledgeTM

Over the plains of Canada, the Inukshuk stone figures, built by Inuit since 1000 AD, guide travelers. Shaped like humans, they mark paths. They symbolize survival.

#General_knowledgeTM

Iron and oxygen account for most of the Earth's mass.

#General_knowledgeTM

Anorexia is the most deadly mental health disorder, carrying a four times greater risk than even depression.

#General_knowledgeTM

Formication is a symptom where you hallucinate the feeling of insects crawling in, on or under your skin. This symptom can be very upsetting or disturbing, leading to other issues like self-injury from scratching or trying to get the insects out from under or inside of your skin.

#General_knowledgeTM

There is a very rare condition called Anton syndrome, in which a person becomes blind however they are unaware of it and will deny it, as their brain generates (false) visual images so they continue to believe that they can see.

#General_knowledgeTM

Android was originally created as an operating system for digital cameras.

#General_knowledgeTM

Tickling was a form of torture used in ancient China nobility, because it left no mark and recovery was quick.

#General_knowledgeTM

Alligators rarely suffer from infections because they have robust immune systems

Their blood is effective against 23 strains of bacteria, and can even destroy a significant amount of HIV.

#General_knowledgeTM

Pupula Duplex is a rare condition where an individual has two pupils instead of one.

#General_knowledgeTM

Ants use “social immunization.” If one is infected with a fungus, they still lick the ant, spreading it throughout the colony. This practice both kills some of the spores, and builds immune resistance.

#General_knowledgeTM

The lump you feel in your throat when you’re nervous or crying is an autonomic response to stress that expands the glottis in an attempt to provide you with more oxygen.

#General_knowledgeTM

The speed record for cars in general was set in 1997 when British racing driver Andy Green drove the Thrust SSC jet to 1,227 km/h, breaking the sound barrier.

#General_knowledgeTM

Saliva contains the protein histatin, which heals wounds.

#General_knowledgeTM

If you eat a piece of bread and butter that contains 315,000 joules (315 kilojoules) of energy, you would have enough energy to walk or ride a bicycle for 15 minutes, jump for 6 minutes, or sleep for 1.5 hours. 315 kilojoules of energy would be enough for a 60 watt light bulb to burn for 1.5 hours, for a car to travel at 80 kilometers per hour for 7 seconds.

#General_knowledgeTM

The wristwatch was originally worn by women, only becoming accepted as a men's accessory over a century later due to the need for efficient, one-handed timekeeping by pilots and soldiers.

#General_knowledgeTM

When the brain lacks food, it slowly shuts down self-control processes.

#General_knowledgeTM

A person who weighs 45 kilograms on Earth would weigh approximately 3 kilograms on Pluto.

#General_knowledgeTM

The throat of a blue whale, the largest animal on Earth, has a diameter of only 10-20 cm.

#General_knowledgeTM

Veronica Seider, a German born in 1951, reportedly had visual acuity around 20/2-about 20 times better than average- allowing her to identify people over a mile (1.6 km) away.

This earned her a Guinness World Record for smallest visible object.

#General_knowledgeTM

Termites are being researched as a possible renewable energy source because their gut microbes can produce up to 2 liters of hydrogen from ingesting a single sheet of paper, making them one of the planet's most efficient bioreactors.

#General_knowledgeTM