It takes about 20 seconds for a red blood cell to circle the whole body.
102
When your face blushes, the lining of your stomach turns red, too.
154
Pain travels through the body at 350 feet per second!
23
Only 1% of bacteria cause disease in humans!
2
Sex burns about 360 calories per hour.
860
While 7 men in 100 have some form of color blindness, only 1 woman in 1,000 suffers from it.
50