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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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Vaccines prevent between 2.5 and 4 million deaths every year.
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Prostaglandins were first isolated from human semen in Sweden in the 1930s. They were so named because the researcher thought that they came from the prostate gland. In fact, prostaglandins exist and are synthesized in almost every cell of the body.
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Eat fiber! A diet high in fiber can help lower cholesterol levels by as much as 10%.
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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.