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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.
The Centers for Disease Control and Prevention (CDC) was originally known as the Communicable Disease Center, which was formed to fight malaria. It was originally headquartered in Atlanta, Georgia, since the Southern states faced the worst threat from malaria.
Women are 50% to 75% more likely than men to experience an adverse drug reaction.
The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.