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More than 150,000 Americans killed by cardiovascular disease are younger than the age of 65 years.
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The familiar sounds of your heart are made by the heart's valves as they open and close.
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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
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The Centers for Disease Control and Prevention (CDC) was originally known as the Communicable Disease Center, which was formed to fight malaria. It was originally headquartered in Atlanta, Georgia, since the Southern states faced the worst threat from malaria.
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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.