It takes about 20 seconds for a red blood cell to circle the whole body.
102
Yawns are more contagious among people with closer relationships.
163
When you are looking at someone you love, your pupils dilate, they do the same when you are looking at someone you hate.
1k
Crying literally alleviates stress and uniquely allows humans to decrease feelings of anger and sadness.
24
In 30 minutes, the average body gives off enough heat (combined) to bring a half gallon of water to boil.
198
Only 12,000 years ago there was a species closely related to modern humans called Homo floresiensis that had been living on an Indonesian Island. They used fire and rather advanced tools, yet were only about 3 feet tall and weighed around 25kg.
15
The human sigh acts as a physiological reset button.
23
Poor eyesight (myopia) is associated with higher IQ.
232