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Did you know?
The familiar sounds of your heart are made by the heart's valves as they open and close.
Did you know?
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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There are approximately 3 million unintended pregnancies in the United States each year.
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Blood is approximately twice as thick as water because of the cells and other components found in it.
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The average adult has about 21 square feet of skin.