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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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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.
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When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.
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About 100 new prescription or over-the-counter drugs come into the U.S. market every year.
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Elderly adults are at greatest risk of stroke and myocardial infarction and have the most to gain from prophylaxis. Patients ages 60 to 80 years with blood pressures above 160/90 mm Hg should benefit from antihypertensive treatment.