It takes about 20 seconds for a red blood cell to circle the whole body.
102
The human sigh acts as a physiological reset button.
23
Your fingernails grow faster in summer.
744
Coughing can cause air to move through your windpipe faster than the speed of sound - over a thousand feet per second!
197
Cats have a weak sense of taste. They have only 473 tastebuds, humans have 9,000.
307
Stress can result in more headaches as a result of the body rerouting blood flow to other parts of the body.
92
Modern humans first appeared about 200,000 years ago, but record keeping didn't begin until about 6,000 years ago. That means about 97% of human history is lost.
21
In 30 minutes, the average body gives off enough heat (combined) to bring a half gallon of water to boil.
198