Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
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Cyanide works by making the human body unable to use oxygen.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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In 1885, the Lloyd Manufacturing Company of Albany, New York, promoted and sold "Cocaine Toothache Drops" at 15 cents per bottle! In 1914, the Harrison Narcotic Act brought the sale and distribution of this drug under federal control.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.