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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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According to the National Institute of Environmental Health Sciences, lung disease is the third leading killer in the United States, responsible for one in seven deaths. It is the leading cause of death among infants under the age of one year.

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The FDA recognizes 118 routes of administration.

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Malaria mortality rates are falling. Increased malaria prevention and control measures have greatly improved these rates. Since 2000, malaria mortality rates have fallen globally by 60% among all age groups, and by 65% among children under age 5.

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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.

The small-scale distribution of different tree species in a Douglas-fir forest is determined by both The small-scale distribution of different tree species in a Douglas-fir forest is determined by both
A small herd of Przewalski's Horses A small herd of Przewalski's Horses
The base of the human cranium is more flexed than the base of the chimpanzee cranium. The base of the human cranium is more flexed than the base of the chimpanzee cranium.
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Video: Bone processes - resorption and deposition, remodeling and response to stress in adult bones

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