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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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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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The oldest recorded age was 122. Madame Jeanne Calment was born in France in 1875 and died in 1997. She was a vegetarian and loved olive oil, port wine, and chocolate.
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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.
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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.