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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A third of the human population sneezes when they look at the Sun. Light can signal the ocular nerve near the sinuses and triggers a sneeze.
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Pain occurs when sounds are above 130 db.
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The human body contains over a billion miles of DNA.
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If your DNA was stretched out it would reach to the moon 6,000 times.
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When you kiss someone for the first time, you get a spike in the neurotransmitter dopamine, making you crave more.
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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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