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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?
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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There are more nerve cells in one human brain than there are stars in the Milky Way.
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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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Human kidneys will clean about 1 million gallons of blood in an average lifetime.