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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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When Gabriel Fahrenheit invented the first mercury thermometer, he called "zero degrees" the lowest temperature he was able to attain with a mixture of ice and salt. For the upper point of his scale, he used 96°, which he measured as normal human body temperature (we know it to be 98.6° today because of more accurate thermometers).
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The first oncogene was discovered in 1970 and was termed SRC (pronounced "SARK").
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The average adult has about 21 square feet of skin.
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There are 20 feet of blood vessels in each square inch of human skin.