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There are 20 feet of blood vessels in each square inch of human skin.
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It is difficult to obtain enough calcium without consuming milk or other dairy foods.
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Ether was used widely for surgeries but became less popular because of its flammability and its tendency to cause vomiting. In England, it was quickly replaced by chloroform, but this agent caused many deaths and lost popularity.
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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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Urine turns bright yellow if larger than normal amounts of certain substances are consumed; one of these substances is asparagus.