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If all the neurons in the human body were lined up, they would stretch more than 600 miles.

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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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People about to have surgery must tell their health care providers about all supplements they take.

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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.

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Acetaminophen (Tylenol) in overdose can seriously damage the liver. It should never be taken by people who use alcohol heavily; it can result in severe liver damage and even a condition requiring a liver transplant.

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