Yawns are more contagious among people with closer relationships.
163
Enamel is hardest substance in the human body.
61
The average person's skin weighs twice as much as their brain.
131
Your thumb is about the same size as your nose.
124
Chewing gum boosts your brain power.
285
Coughing can cause air to move through your windpipe faster than the speed of sound - over a thousand feet per second!
197
If your DNA was stretched out it would reach to the moon 6,000 times.
256
Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
118