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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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Everyone has one nostril that is larger than the other.
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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
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People with high total cholesterol have about two times the risk for heart disease as people with ideal levels.
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Drugs are in development that may cure asthma and hay fever once and for all. They target leukotrienes, which are known to cause tightening of the air passages in the lungs and increase mucus productions in nasal passages.