After age 30, the brain begins to lose about 50,000 neurons per day - shrinking the brain .25% each year.
55
While 7 men in 100 have some form of color blindness, only 1 woman in 1,000 suffers from it.
50
It takes twice as long to lose new muscle if you stop working out than it did to gain it.
127
It takes about 20 seconds for a red blood cell to circle the whole body.
102
About 400 different kinds of microbes live on and in the human body.
-3
Fingernails grow nearly 4 times faster than toenails.
31
Some people have a "natural alarm clock" allowing them to wake up when they want. This is actually caused by a burst of the stress hormone adrenocorticotropin.
15