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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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Cyanide works by making the human body unable to use oxygen.
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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
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More than 20 million Americans cite use of marijuana within the past 30 days, according to the National Survey on Drug Use and Health (NSDUH). More than 8 million admit to using it almost every day.
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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.