The human brain is insensitive to pain.
76
Smoking while pregnant increases the chances of spontaneous abortions (miscarriages) stillbirths and premature labor.
77
Dogs can be trained to identify the scent of lung cancer long before symptoms develop.
190
The average human body contains enough iron to make a small nail.
50
Human thigh bones are stronger than concrete!
63
Cracking your knuckles does not actually hurt your bones or cause arthritis. The sound you hear is just gas bubbles bursting.
18
Poor eyesight (myopia) is associated with higher IQ.
232
