Tigers can see 6 times better at night than humans.
305
There are glasses which allow a red-green color-blind person to see colors the way everyone else does.
22
When you are looking at someone you love, your pupils dilate, they do the same when you are looking at someone you hate.
1k
For most people, no matter how hard you pinch the skin on your elbow with your fingers it doesn't hurt.
515
Enamel is hardest substance in the human body.
61
Early American humans hunted car-size armadillos and used their shells for houses.
12
We share 70% of our DNA with a slug.
218
