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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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It is difficult to obtain enough calcium without consuming milk or other dairy foods.
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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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Eat fiber! A diet high in fiber can help lower cholesterol levels by as much as 10%.
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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.