Enamel is hardest substance in the human body.
61
There are times when you're walking that the pressure on your feet exceeds your body weight, and when you're running, it can be three or four times your weight.
62
Crying literally alleviates stress and uniquely allows humans to decrease feelings of anger and sadness.
24
There are glasses which allow a red-green color-blind person to see colors the way everyone else does.
22
Sitting straight upright in your chair is bad for your back. You should instead slouch at an angle of 135 degrees.
10
The brain can stay alive for 4 to 6 minutes without oxygen. After that cells begin die.
193
By weight, Bone is five times stronger than steel.
417

