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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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No drugs are available to relieve parathyroid disease. Parathyroid disease is caused by a parathyroid tumor, and it needs to be removed by surgery.
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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
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The Babylonians wrote numbers in a system that used 60 as the base value rather than the number 10. They did not have a symbol for "zero."
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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.