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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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To combat osteoporosis, changes in lifestyle and diet are recommended. At-risk patients should include 1,200 to 1,500 mg of calcium daily either via dietary means or with supplements.
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The longest a person has survived after a heart transplant is 24 years.
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Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.
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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.