A hard working adult sweats up to 4 gallons per day. Most of the sweat evaporates before a person realizes it's there, though!
25
The aorta, the largest artery in the body, is almost the diameter of a garden hose.
37
The adult human brain weighs about 3 pounds (1,300-1,400 g).
99
Flu shots only work about 70% of the time.
18
The human body contains over a billion miles of DNA.
147
Fingernails grow nearly 4 times faster than toenails!
30
Human thigh bones are stronger than concrete!
63
You can alleviate a tickly throat by scratching your ear.
9