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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Early American humans hunted car-size armadillos and used their shells for houses.
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The largest cell in the human body is the female egg and the smallest is the male sperm.
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A human brain produces as many as 12,000 to 50,000 thoughts per day, depending on how deep a thinker a person is.
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The human brain doesn't stop developing until about 25 years old.
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Babies crawl an average of 200m a day.
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If the human eye was a digital camera, it would have 576 megapixels.
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