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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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Urine turns bright yellow if larger than normal amounts of certain substances are consumed; one of these substances is asparagus.
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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
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There are more sensory neurons in the tongue than in any other part of the body.