If the human eye was a digital camera, it would have 576 megapixels.
25
Crying literally alleviates stress and uniquely allows humans to decrease feelings of anger and sadness.
24
Your fingernails grow faster in summer.
744
The average sperm cell swims at 8 inches per hour.
4
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
The largest cell in the human body is the female egg and the smallest is the male sperm.
682
The human sigh acts as a physiological reset button.
23
