It takes twice as long to lose new muscle if you stop working out than it did to gain it.
127
Coughing can cause air to move through your windpipe faster than the speed of sound - over a thousand feet per second!
197
By weight, Bone is five times stronger than steel.
417
The human eye blinks an average of 4,200,000 times a year.
233
On average a woman has 4 sexual partners in her lifetime.
-143
There are times when you're walking that the pressure on your feet exceeds your body weight, and when you're running, it can be three or four times your weight.
62
When you kiss someone for the first time, you get a spike in the neurotransmitter dopamine, making you crave more.
23
Early American humans hunted car-size armadillos and used their shells for houses.
12