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Did you know?

The tallest man ever known was Robert Wadlow, an American, who reached the height of 8 feet 11 inches. He died at age 26 years from an infection caused by the immense weight of his body (491 pounds) and the stress on his leg bones and muscles.

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There are more nerve cells in one human brain than there are stars in the Milky Way.

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There are approximately 3 million unintended pregnancies in the United States each year.

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Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.

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When blood is deoxygenated and flowing back to the heart through the veins, it is dark reddish-blue in color. Blood in the arteries that is oxygenated and flowing out to the body is bright red. Whereas arterial blood comes out in spurts, venous blood flows.

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Video: Phases of the ovarian cycle

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