There are glasses which allow a red-green color-blind person to see colors the way everyone else does.
22
A human being loses an average of 40 to 100 strands of hair a day.
133
A third of the human population sneezes when they look at the Sun. Light can signal the ocular nerve near the sinuses and triggers a sneeze.
18
Pet dogs and elephants are the only animals that seem to instinctively understand human gesture.
14
The average sperm cell swims at 8 inches per hour.
4
Your heart will pump about 212 million liters in its lifetime.
26
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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