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Aspirin is the most widely used drug in the world. It has even been recognized as such by the Guinness Book of World Records.
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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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Everyone has one nostril that is larger than the other.
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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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A seasonal flu vaccine is the best way to reduce the chances you will get seasonal influenza and spread it to others.