Modern humans first appeared about 200,000 years ago, but record keeping didn't begin until about 6,000 years ago. That means about 97% of human history is lost.
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Only 12,000 years ago there was a species closely related to modern humans called Homo floresiensis that had been living on an Indonesian Island. They used fire and rather advanced tools, yet were only about 3 feet tall and weighed around 25kg.
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It has been scientifically proven that stroking a cat can lower one's blood pressure!
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An average heart beats 100,000 times a day, pumping some 2,000 gallons of blood through its chambers. Over a 70-year life span, that adds up to more than 2.5 billion heartbeats.
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Your heart will pump about 212 million liters in its lifetime.
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Crying literally alleviates stress and uniquely allows humans to decrease feelings of anger and sadness.
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Some monks can increase their body temperature so much they can dry soaking sheets in a freezing room!
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Tigers can see 6 times better at night than humans.
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