If your stomach didn't produce a new layer of mucous every two weeks, it would digest itself.
33
Coughing can cause air to move through your windpipe faster than the speed of sound - over a thousand feet per second!
197
When you get goosebumps and your hair stands, the hair helps to trap air, making you feel warmer by keeping in your body heat.
46
The adult human brain weighs about 3 pounds (1,300-1,400 g).
99
Dogs can be trained to identify the scent of lung cancer long before symptoms develop.
190
Our eyes are always the same size from birth, but our nose and ears never stop growing.
266
20 minutes after smoking a cigarette, blood pressure drops to normal.
37
"Fish odor syndrome" is a rare genetic disorder that causes people to smell like rotten fish.
5