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Approximately 500,000 babies are born each year in the United States to teenage mothers.
There are more nerve cells in one human brain than there are stars in the Milky Way.
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.
ACTH levels are normally highest in the early morning (between 6 and 8 A.M.) and lowest in the evening (between 6 and 11 P.M.). Therefore, a doctor who suspects abnormal levels looks for low ACTH in the morning and high ACTH in the evening.
In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.