It takes 17 muscles to smile, 43 to frown.
65
After age 30, the brain begins to lose about 50,000 neurons per day - shrinking the brain .25% each year.
55
The human brain is more active during sleep than during the day.
28
By weight, Bone is five times stronger than steel.
417
Every hour one billion cells in the body must be replaced.
17
Dentists have recommended that a toothbrush be kept at least 6 feet away from a toilet to avoid airborne particles resulting from the flush.
104