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
If Earth's life was compressed into 1 year, then humans would have been around for only 2 seconds.
15
An unprotected human can survive up to 1.5 minutes in space with no permanent bodily damage.
82
Your thumb is about the same size as your nose.
124
The human sigh acts as a physiological reset button.
23
Our brains have a negativity bias and will remember bad memories more than good ones.
15
The adult human brain weighs about 3 pounds (1,300-1,400 g).
99
For most people, no matter how hard you pinch the skin on your elbow with your fingers it doesn't hurt.
515