The ears:  A piano has 88 keys, but each of your ears has a keyboard with 1,500 keys.  They are so finely tuned that you can hear the blood running through your vessels.  The outside of your ear can catch up to 73,700 vibrations per second.

The eyes:  They are both microscopes and telescopes.  They can gaze into the heavens and see a star millions of miles away, or inspect a tiny insect.

The feet:  Each foot has 26 bones, none of which is wider than your thumb.  It is so “made” (arched) with its ligaments, tendons, muscles and joints that a 300-pound man can put all his weight on these tiny bones.

The heart:  Its size is about like your fist, but pumps (beats) 4,320 times an hour.  In a year that would mean 40 million beats.  A drop of blood can make a round trip in your circulatory system in only 22 seconds.