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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.
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Thyroid conditions cause a higher risk of fibromyalgia and chronic fatigue syndrome.
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Of the estimated 2 million heroin users in the United States, 600,000–800,000 are considered hardcore addicts. Heroin addiction is considered to be one of the hardest addictions to recover from.
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Cyanide works by making the human body unable to use oxygen.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.