Your fingernails grow faster in summer.
744
The world's shortest man measures only 21.5 inches.
73
Pet dogs and elephants are the only animals that seem to instinctively understand human gesture.
14
Enamel is hardest substance in the human body.
61
In ancient Egypt, priests plucked EVERY hair from their bodies, including their eyebrows and eyelashes.
130
The oldest stone tools found are dated from 2.7 - 2.9 million years ago. The species that made these tools is unknown.
13
Our brains have a negativity bias and will remember bad memories more than good ones.
15