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Vaccines prevent between 2.5 and 4 million deaths every year.
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Parkinson's disease is both chronic and progressive. This means that it persists over a long period of time and that its symptoms grow worse over time.
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In 1864, the first barbiturate (barbituric acid) was synthesized.
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Between 1999 and 2012, American adults with high total cholesterol decreased from 18.3% to 12.9%
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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.