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Cyanide works by making the human body unable to use oxygen.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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Signs of depression include feeling sad most of the time for 2 weeks or longer; loss of interest in things normally enjoyed; lack of energy; sleep and appetite disturbances; weight changes; feelings of hopelessness, helplessness, or worthlessness; an inability to make decisions; and thoughts of death and suicide.
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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.
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Street names for barbiturates include reds, red devils, yellow jackets, blue heavens, Christmas trees, and rainbows. They are commonly referred to as downers.