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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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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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Asthma cases in Americans are about 75% higher today than they were in 1980.

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If all the neurons in the human body were lined up, they would stretch more than 600 miles.

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More than 34,000 trademarked medication names and more than 10,000 generic medication names are in use in the United States.

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