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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.
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Not getting enough sleep can greatly weaken the immune system. Lack of sleep makes you more likely to catch a cold, or more difficult to fight off an infection.
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Excessive alcohol use costs the country approximately $235 billion every year.
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Your heart beats over 36 million times a year.
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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.