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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Your thumb is about the same size as your nose.
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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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A man's beard grows fastest when he anticipates sex.
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The human brain uses approximately as much energy as a 10 watt light bulb.
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We forget why we have entered a room because passing through doors creates an ‘event boundary’ causing the brain to file away what we were just thinking about.
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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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