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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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Interferon was scarce and expensive until 1980, when the interferon gene was inserted into bacteria using recombinant DNA technology, allowing for mass cultivation and purification from bacterial cultures.

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Nearly 31 million adults in America have a total cholesterol level that is more than 240 mg per dL.

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Normal urine is sterile. It contains fluids, salts, and waste products. It is free of bacteria, viruses, and fungi.

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Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.

Acromegaly in one individual from a pair of identical twins. Acromegaly in one individual from a pair of identical twins.
Examples of asexual reproduction. Examples of asexual reproduction.
Dissimilar organisms with similar approaches to desert living. Dissimilar organisms with similar approaches to desert living.
A melanistic jaguar at the Henry Doorly Zoo. Melanism is the result of a dominant allele and remains A melanistic jaguar at the Henry Doorly Zoo. Melanism is the result of a dominant allele and remains
In 2008, the U.S. economy suffered a gaping wound as several trillion dollars were ripped out of it. In 2008, the U.S. economy suffered a gaping wound as several trillion dollars were ripped out of it.
A 2-fold serial dilution showing the result of moving 0.2 ml of green food coloring successively ... A 2-fold serial dilution showing the result of moving 0.2 ml of green food coloring successively ...
Video: Genetic distance between human groups

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