After age 30, the brain begins to lose about 50,000 neurons per day - shrinking the brain .25% each year.
55
There are glasses which allow a red-green color-blind person to see colors the way everyone else does.
22
You can hear the blood flowing through your ears if you find a quiet place and cover them tightly.
17
Our eyes are always the same size from birth, but our nose and ears never stop growing.
266
Your body is creating and killing about 2.4 million red blood cells per second.
17
There's 100 trillion good bacteria living in your body.
17
The average sperm cell swims at 8 inches per hour.
76