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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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Everyone has one nostril that is larger than the other.
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Interferon was scarce and expensive until 1980, when the interferon gene was inserted into bacteria using recombinant DNA technology, allowing for mass cultivation and purification from bacterial cultures.
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In most cases, kidneys can recover from almost complete loss of function, such as in acute kidney (renal) failure.
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Human neurons are so small that they require a microscope in order to be seen. However, some neurons can be up to 3 feet long, such as those that extend from the spinal cord to the toes.