Your fingernails grow faster in summer.
744
You can't tickle yourself.
29
Pain occurs when sounds are above 130 db.
124
Humans are capable of running 40 mph according to a study by bio-mechanical expert Dr. Matthew Bundle. Today's fastest man, Usain Bolt, has a top speed of 28 mph.
35
Crying literally alleviates stress and uniquely allows humans to decrease feelings of anger and sadness.
24
When you are looking at someone you love, your pupils dilate, they do the same when you are looking at someone you hate.
1k
One human hair can support 3 ounces.
191
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