Fun Facts

There are over 640 muscles in the human body.

There are 206 bones in an adult human body. There are about 300 at birth.

It is impossible to lick your elbow.

Human jaw muscles can generate a force of 200 pounds on the molars.

Toenails and fingernails are actually made from skin cells.

Sun exposure is cumulative, which means that your skin hasn’t forgotten the sunshine you enjoyed last year or the year before. (Don’t forget your sunscreen!)

How fast are nerve signals? Some, like the ones for muscle position travel on extra fast nerve fibers at speeds of up to 390 feet per second! Close your eyes and wave your arms around: you can tell where they are at every moment because the muscle-position nerves are very fast. But other messages, like some kinds of pain signals, travel more slowly. If you stub your toe, you feel the pressure right away because touch signals travel 250 feet per second. But you won’t feel the pain for another 2 or 3 seconds because pain signals generally travel at only 2 feet per second.

The average person can live without food for a few weeks, depending on their body type.

The average person can live without water for 3 or 4 days.

The average person needs 7 to 9 hours of sleep each night.