Three years after a person quits smoking, their chance of having a heart attack is the same as someone who has never smoked before.

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The kidneys filter over 400 gallons of blood each day.

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Constipation is caused when too much water is absorbed in the large intestine and poops become dry.

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An adult has 206 bones, and a newborn has 300.

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The loss of eyelashes is referred to as madarosis.

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Just behind the pupil is a lens. It is round and flat. It is thicker toward the middle.

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Pain signals travel along hour nerves at 50 feet per second.

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The average human head weighs about eight pounds.

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Native Americans used to use pumpkin seeds for medicine.

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The early occurrence of a fetus yawning is at eleven weeks after conception.

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