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More than half the bones in your body are located in your hands and feet.

There is enough iron in the human body to make one small nail.

Women blink almost twice as much as men.

A sneeze can exceed the speed of 100 mph.

An average human drinks about 16,000 gallons of water in a lifetime.

Beards are the fastest growing hair. If the average man never trimmed his beard, it could grow to 30 feet over the course of his lifetime.

Every person has a unique tongue print.

Fingernails grow faster than toenails and your middle fingernail is the quickest one to grow. It takes about 150 days to grow out a full length fingernail.

Your brain continues to send out electrical wave signals approximately 37 hours after death.

The nervous system transmits messages to the brain at speeds of 180 miles per hour.

The human nose can remember 50,000 different smells.

The human eye can detect more than 10,000,000 different colors!

Your jawbone is the hardest bone in your body.

When you were born, you had 350 bones in your body, and after childhood 144 of these bones fused together.

Your brain stops growing when you are about 15 years old.

Laughing and coughing put more pressure on the spine than walking or standing.

Your stomach produces a new lining every 3 days in order to avoid digesting itself in its own production of acid.

About every seven years, your body replaces the equivalent of an entirely new skeleton.

The spinal cord is less then two feet in length and is the same diameter as your index finger, yet it contains over 10 billion nerve cells.

Blood type A can receive blood types A & O safely. Blood type B can receive types B & O. Blood type O can receive only O blood but are "universal donors" because O is acceptable to all other blood types. Blood type O is the most common blood type worldwide.

The eye muscle is the fastest reacting muscle of the whole body. It contracts in less than 1/100th of a second.

It takes approximately 200,000 frowns to create one permanent brow line.

Your eyesight is the sharpest in the middle of the day.

From innerbody.com, biology.about.com and teach-nology.com

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