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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It took 200,000 years for humans to reach 3 billion in number. It took 40 years for the next 3 billion.
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The human brain is more active during sleep than during the day.
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The human body contains over a billion miles of DNA.
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A human being loses an average of 40 to 100 strands of hair a day.
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On average, a human being will have sex more than 3,000 times and spend two weeks kissing in their lifetime.
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If your DNA was stretched out it would reach to the moon 6,000 times.
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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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