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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.

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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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Of the estimated 2 million heroin users in the United States, 600,000–800,000 are considered hardcore addicts. Heroin addiction is considered to be one of the hardest addictions to recover from.

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The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.

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In most climates, 8 to 10 glasses of water per day is recommended for adults. The best indicator for adequate fluid intake is frequent, clear urination.

This lithograph of the New York draft riots, 1863, shows that although the rioters mainly targeted b This lithograph of the New York draft riots, 1863, shows that although the rioters mainly targeted b
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