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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Women have about four times as many foot problems as men; lifelong patterns of wearing high heels often are the culprit.
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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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Crying literally alleviates stress and uniquely allows humans to decrease feelings of anger and sadness.
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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 has the capacity to store everything that you experience.
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The human eye blinks an average of 4,200,000 times a year.
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Early American humans hunted car-size armadillos and used their shells for houses.
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