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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If the human eye was a digital camera, it would have 576 megapixels.
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A person can live without food for about a month, but only about a week without water.
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After age 30, the brain shrinks a quarter of a percent (0.25%) in mass each year.
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It takes about 20 seconds for a red blood cell to circle the whole body.
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There are about 255 babies born worldwide every minute.
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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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