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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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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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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.
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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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Since 1988, the CDC has reported a 99% reduction in bacterial meningitis caused by Haemophilus influenzae, due to the introduction of the vaccine against it.