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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 average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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There are more nerve cells in one human brain than there are stars in the Milky Way.
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If you could remove all of your skin, it would weigh up to 5 pounds.
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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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