Yawns are more contagious among people with closer relationships.
163
Enamel is hardest substance in the human body.
61
When you take a step, you are using up to 200 muscles.
886
After age 30, the brain begins to lose about 50,000 neurons per day - shrinking the brain .25% each year.
55
Coughing can cause air to move through your windpipe faster than the speed of sound - over a thousand feet per second!
197
Poor eyesight (myopia) is associated with higher IQ.
232
The human body contains over a billion miles of DNA.
147
The average person's skin weighs twice as much as their brain.
131