Our brains have a negativity bias and will remember bad memories more than good ones.
15
Enamel is hardest substance in the human body.
61
Yawns are more contagious among people with closer relationships.
163
Tigers can see 6 times better at night than humans.
305
If your DNA was stretched out it would reach to the moon 6,000 times.
256
You can't tickle yourself.
29
Pet dogs and elephants are the only animals that seem to instinctively understand human gesture.
14
A person will create enough saliva to fill two average size swimming pools during his lifetime.
191