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The familiar sounds of your heart are made by the heart's valves as they open and close.
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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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Drying your hands with a paper towel will reduce the bacterial count on your hands by 45–60%.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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Approximately 25% of all reported medication errors result from some kind of name confusion.