Only humans shed emotional tears.
331
Pain occurs when sounds are above 130 db.
124
For most people, no matter how hard you pinch the skin on your elbow with your fingers it doesn't hurt.
515
We share 70% of our DNA with a slug.
218
When you are looking at someone you love, your pupils dilate, they do the same when you are looking at someone you hate.
1k
Enamel is hardest substance in the human body.
61
The human brain is more active during sleep than during the day.
28