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.
21
A human being loses an average of 40 to 100 strands of hair a day.
133
In ancient Egypt, priests plucked EVERY hair from their bodies, including their eyebrows and eyelashes.
130
When you are looking at someone you love, your pupils dilate, they do the same when you are looking at someone you hate.
1k
Research has determined that most people are happiest at 7:26pm on a Saturday night.
69
The adult human brain weighs about 3 pounds (1,300-1,400 g).
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The average sperm cell swims at 8 inches per hour.
4
The human brain uses approximately as much energy as a 10 watt light bulb.
120