It takes 17 muscles to smile, 43 to frown.
65
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
Your skin is actually an organ.
88
Fingernails grow nearly 4 times faster than toenails!
30
Human thigh bones are stronger than concrete!
63
Every day, the average person swallows about a quart of mucous.
5


