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The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.
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.
The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
Approximately one in three babies in the United States is now delivered by cesarean section. The number of cesarean sections in the United States has risen 46% since 1996.
Illicit drug use costs the United States approximately $181 billion every year.