The thickness of your skin varies from 1/2 to 6 millimeters, depending on the area of your body.

The four taste zones on your tongue are bitter (back), sour (back sides), salty (front sides), and sweet (front).

The five senses are sight, hearing, smell, touch, and taste.

Your body contains eight pints of blood.

You use 14 muscles to smile and 43 to frown.

The strongest muscle of the body is the masseter muscle, which is located in the jaw.

Muscles normally account for 40 percent of one's body weight.

There are 230 joints in the body.

Kids have 20 first teeth. Adults have 32 teeth.

The small intestines are about 25 feet long.

The large intestines are five feet long and are three times wider than the small intestines.

Most people shed 40 pounds of skin in a lifetime.

Your body is 70 percent water.

Normal body temperature is 98.6° Fahrenheit.

When you sneeze, air rushes through your nose at a rate of 100 mph.

An eyelash lives about 150 days before it falls out.

Your brain sends messages at the rate of 240 mph.

About 400 gallons of blood flow through your kidneys in one day.

You blink your eyes about 20,000 times a day.

Your heart beats about 100,000 times a day.

Humans breathe 20 times per minute, more than 10 million times per year and about 700 million times in a lifetime.

You have about 100,000 hairs on your head.

There are 10 million nerve cells in your brain.

Each of your eyes has 120 million rods, which help you see in black and white.

Each eye has six million cones, which help you see in color.

One in 12 men is color blind.

Placed end to end, all your body's blood vessels would measure about 62,000 miles.

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