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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The human body contains over a billion miles of DNA.
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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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Our Right Lungs takes more air than our left lung.
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There are glasses which allow a red-green color-blind person to see colors the way everyone else does.
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An average heart beats 100,000 times a day, pumping some 2,000 gallons of blood through its chambers. Over a 70-year life span, that adds up to more than 2.5 billion heartbeats.
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The average person's skin weighs twice as much as their brain.
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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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