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Vaccines prevent between 2.5 and 4 million deaths every year.

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In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.

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The U.S. Preventive Services Task Force recommends that all women age 65 years of age or older should be screened with bone densitometry.

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About 600,000 particles of skin are shed every hour by each human. If you live to age 70 years, you have shed 105 pounds of dead skin.

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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.

The four ways in which animals exchange heat with the environment are radiation, evaporation, convec The four ways in which animals exchange heat with the environment are radiation, evaporation, convec
Managing large bands of grazing animals requires detailed knowledge of local landscapes, especially Managing large bands of grazing animals requires detailed knowledge of local landscapes, especially
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Video: Sickle Cell Anemia

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