If Earth's life was compressed into 1 year, then humans would have been around for only 2 seconds.
15
We share 70% of our DNA with a slug.
218
It takes about 20 seconds for a red blood cell to circle the whole body.
102
Early American humans hunted car-size armadillos and used their shells for houses.
12
Coughing can cause air to move through your windpipe faster than the speed of sound - over a thousand feet per second!
197
If the human eye was a digital camera, it would have 576 megapixels.
25
Mushrooms are more closely related to humans than they are to plants.
47
For most people, no matter how hard you pinch the skin on your elbow with your fingers it doesn't hurt.
515