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Aspirin is the most widely used drug in the world. It has even been recognized as such by the Guinness Book of World Records.
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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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If all the neurons in the human body were lined up, they would stretch more than 600 miles.
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There are more nerve cells in one human brain than there are stars in the Milky Way.
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More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.