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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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There are more bacteria in your mouth than there are people in the world.
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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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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
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Allergies play a major part in the health of children. The most prevalent childhood allergies are milk, egg, soy, wheat, peanuts, tree nuts, and seafood.