An average heart beats 100,000 times a day, pumping some 2,000 gallons of blood through its chambers. Over a 70-year life span, that adds up to more than 2.5 billion heartbeats.
73
Cats have a weak sense of taste. They have only 473 tastebuds, humans have 9,000.
307
The human sigh acts as a physiological reset button.
23
For most people, no matter how hard you pinch the skin on your elbow with your fingers it doesn't hurt.
515
If Earth's life was compressed into 1 year, then humans would have been around for only 2 seconds.
15
When you are looking at someone you love, your pupils dilate, they do the same when you are looking at someone you hate.
1k
An unprotected human can survive up to 1.5 minutes in space with no permanent bodily damage.
82