astounding facts about the human body

When we touch something, we send a message to our brain at 124 mph

We exercise at least 36 muscles when we smile.

We are about 70 percent water.

We make around 1 to 1.6 litres of saliva a day.

Our nose is our personal air conditioning system: it warms cold air, cools hot air and filters impurities.

?In one square inch of our hand we have nine feet of blood vessels, 600 pain sensors, 9000 nerve endings, 36 heat sensors and 75 pressure sensors.

We have copper, zinc, cobalt, calcium, manganese, phosphates, nickel and silicon in our bodies.

?It is believed that the main purpose of eyebrows is to keep sweat out of the eyes.

A person can expect to breathe in about 45 pounds of dust over his/her lifetime.

There are more living organisms on the skin of a single human being than there are human beings on the surface of the earth.