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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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Your heart beats over 36 million times a year.

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Eating food that has been cooked with poppy seeds may cause you to fail a drug screening test, because the seeds contain enough opiate alkaloids to register as a positive.

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There are major differences in the metabolism of morphine and the illegal drug heroin. Morphine mostly produces its CNS effects through m-receptors, and at k- and d-receptors. Heroin has a slight affinity for opiate receptors. Most of its actions are due to metabolism to active metabolites (6-acetylmorphine, morphine, and morphine-6-glucuronide).

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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.

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