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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
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Oliver Wendell Holmes is credited with introducing the words "anesthesia" and "anesthetic" into the English language in 1846.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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More than nineteen million Americans carry the factor V gene that causes blood clots, pulmonary embolism, and heart disease.
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