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If you could remove all of your skin, it would weigh up to 5 pounds.

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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.

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If all the neurons in the human body were lined up, they would stretch more than 600 miles.

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The B-complex vitamins and vitamin C are not stored in the body and must be replaced each day.

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The eye muscles are the most active muscles in the whole body. The external muscles that move the eyes are the strongest muscles in the human body for the job they have to do. They are 100 times more powerful than they need to be.

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