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Vaccines prevent between 2.5 and 4 million deaths every year.
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The human body produces and destroys 15 million blood cells every second.
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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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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.
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Urine turns bright yellow if larger than normal amounts of certain substances are consumed; one of these substances is asparagus.