It takes twice as long to lose new muscle if you stop working out than it did to gain it.
127
The human body contains over a billion miles of DNA.
147
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 takes about 20 seconds for a red blood cell to circle the whole body.
102
Crying literally alleviates stress and uniquely allows humans to decrease feelings of anger and sadness.
24
On average, there's 100 billion neurons in the human brain.
83
Only humans shed emotional tears.
331
Your thumb is about the same size as your nose.
124