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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
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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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In 1864, the first barbiturate (barbituric acid) was synthesized.
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Illicit drug use costs the United States approximately $181 billion every year.
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Malaria was not eliminated in the United States until 1951. The term eliminated means that no new cases arise in a country for 3 years.