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
Yawns are more contagious among people with closer relationships.
163
There are glasses which allow a red-green color-blind person to see colors the way everyone else does.
22
Some monks can increase their body temperature so much they can dry soaking sheets in a freezing room!
31
Modern humans first appeared about 200,000 years ago, but record keeping didn't begin until about 6,000 years ago. That means about 97% of human history is lost.
21
In one day, adult lungs move about 10,000 litres of air.
11
On average, a human being will have sex more than 3,000 times and spend two weeks kissing in their lifetime.
161
An unprotected human can survive up to 1.5 minutes in space with no permanent bodily damage.
82