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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.
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If all the neurons in the human body were lined up, they would stretch more than 600 miles.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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Nitroglycerin is used to alleviate various heart-related conditions, and it is also the chief component of dynamite (but mixed in a solid clay base to stabilize it).
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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.