Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
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HIV testing reach is still limited. An estimated 40% of people with HIV (more than 14 million) remain undiagnosed and do not know their infection status.
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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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Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.
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The longest a person has survived after a heart transplant is 24 years.
Reindeer antlers grow again each year under a layer of fur called velvet. This reindeer is losing th
Assessing for Tinel's Sign
Sources and Amounts of Oil Released into North American Marine Waters
Rate of Residential Change, Past Year, in the United States
In 1979 Islamic militants held American embassy workers hostage in Tehran.
Parenting Styles Reported by a Representative Sample of American Adolescents