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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.
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.
More than 34,000 trademarked medication names and more than 10,000 generic medication names are in use in the United States.
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.
Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.