Your fingernails grow faster in summer.
744
An unprotected human can survive up to 1.5 minutes in space with no permanent bodily damage.
82
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
It took 200,000 years for humans to reach 3 billion in number. It took 40 years for the next 3 billion.
11
Women have about four times as many foot problems as men; lifelong patterns of wearing high heels often are the culprit.
111
Shark corneas are used in eye transplants and shark bone marrow can be used to graft human bones.
132
Crying literally alleviates stress and uniquely allows humans to decrease feelings of anger and sadness.
24
If the human eye was a digital camera, it would have 576 megapixels.
25