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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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About 600,000 particles of skin are shed every hour by each human. If you live to age 70 years, you have shed 105 pounds of dead skin.
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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
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Eat fiber! A diet high in fiber can help lower cholesterol levels by as much as 10%.
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The human body produces and destroys 15 million blood cells every second.