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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 believed that the Incas used anesthesia. Evidence supports the theory that shamans chewed cocoa leaves and drilled holes into the heads of patients (letting evil spirits escape), spitting into the wounds they made. The mixture of cocaine, saliva, and resin numbed the site enough to allow hours of drilling.
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The first oral chemotherapy drug for colon cancer was approved by FDA in 2001.
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The B-complex vitamins and vitamin C are not stored in the body and must be replaced each day.
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If you could remove all of your skin, it would weigh up to 5 pounds.