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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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Normal urine is sterile. It contains fluids, salts, and waste products. It is free of bacteria, viruses, and fungi.
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More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.
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Amoebae are the simplest type of protozoans, and are characterized by a feeding and dividing trophozoite stage that moves by temporary extensions called pseudopodia or false feet.
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Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.