Yawns are more contagious among people with closer relationships.
163
One human hair can support 3 ounces.
191
The human body contains over a billion miles of DNA.
147
Enamel is hardest substance in the human body.
61
Coughing can cause air to move through your windpipe faster than the speed of sound - over a thousand feet per second!
197
If you are cold you are more likely to be hungry because you use energy to keep warm.
143
Poor eyesight (myopia) is associated with higher IQ.
232