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Long-term mental and physical effects from substance abuse include: paranoia, psychosis, immune deficiencies, and organ damage.
The familiar sounds of your heart are made by the heart's valves as they open and close.
Vaccines prevent between 2.5 and 4 million deaths every year.
An identified risk factor for osteoporosis is the intake of excessive amounts of vitamin A. Dietary intake of approximately double the recommended daily amount of vitamin A, by women, has been shown to reduce bone mineral density and increase the chances for hip fractures compared with women who consumed the recommended daily amount (or less) of vitamin A.
In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.