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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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In 1835 it was discovered that a disease of silkworms known as muscardine could be transferred from one silkworm to another, and was caused by a fungus.
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There are approximately 3 million unintended pregnancies in the United States each year.
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There are more nerve cells in one human brain than there are stars in the Milky Way.
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More than 4.4billion prescriptions were dispensed within the United States in 2016.