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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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Cytomegalovirus affects nearly the same amount of newborns every year as Down syndrome.
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HIV testing reach is still limited. An estimated 40% of people with HIV (more than 14 million) remain undiagnosed and do not know their infection status.
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The lipid bilayer is made of phospholipids. They are arranged in a double layer because one of their ends is attracted to water while the other is repelled by water.
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Blood is approximately twice as thick as water because of the cells and other components found in it.