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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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Many of the drugs used by neuroscientists are derived from toxic plants and venomous animals (such as snakes, spiders, snails, and puffer fish).
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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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When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.
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Throughout history, plants containing cardiac steroids have been used as heart drugs and as poisons (e.g., in arrows used in combat), emetics, and diuretics.