The oldest stone tools found are dated from 2.7 - 2.9 million years ago. The species that made these tools is unknown.
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Every human spent about half an hour as a single cell.
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The human eye blinks an average of 4,200,000 times a year.
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Shark corneas are used in eye transplants and shark bone marrow can be used to graft human bones.
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It is possible for you to survive even after the removal of the spleen, the stomach, one kidney, one lung, 75% of the liver, 80% of the intestines, and almost every organ from the pelvic and groin area.
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It takes approximately 12 hours for food to entirely digest.
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