The largest cell in the human body is the female egg and the smallest is the male sperm.
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Every human spent about half an hour as a single cell.
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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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The human brain doesn't stop developing until about 25 years old.
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It takes approximately 12 hours for food to entirely digest.
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When you are looking at someone you love, your pupils dilate, they do the same when you are looking at someone you hate.
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There are about 255 babies born worldwide every minute.
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Having sex can make a woman look younger and more attractive due to the release of estrogen and collagen.
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