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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More than 150,000 Americans killed by cardiovascular disease are younger than the age of 65 years.
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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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Illicit drug use costs the United States approximately $181 billion every year.
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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
Some organisms used as models in genetic research
The central and peripheral nervous system
Central portal of the west facade, Reims Cathedral, France.
(A) In hyperopia, light rays focus behind the retina, making it difficult to focus on objects at ...