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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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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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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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The first oncogene was discovered in 1970 and was termed SRC (pronounced "SARK").
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The top five reasons that children stay home from school are as follows: colds, stomach flu (gastroenteritis), ear infection (otitis media), pink eye (conjunctivitis), and sore throat.