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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?
Every 10 seconds, a person in the United States goes to the emergency room complaining of head pain. About 1.2 million visits are for acute migraine attacks.
Did you know?
About 100 new prescription or over-the-counter drugs come into the U.S. market every year.
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There are 20 feet of blood vessels in each square inch of human skin.
Did you know?
More than 50% of American adults have oral herpes, which is commonly known as "cold sores" or "fever blisters." The herpes virus can be active on the skin surface without showing any signs or causing any symptoms.
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