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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.
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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.
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Cyanide works by making the human body unable to use oxygen.
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Amoebae are the simplest type of protozoans, and are characterized by a feeding and dividing trophozoite stage that moves by temporary extensions called pseudopodia or false feet.
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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.