So why do so many life-forms breathe oxygen? There are probably thousands of kinds of metabolisms, or chemical processes that maintain life, said Donald Canfield, a geobiologist at the University of ...

Chlorine and oxygen can generate similar amounts of energy. Fluorine could certainly provide more energy than oxygen, but "fluorine is [...] useless as a biological oxidant because it generates an ...

The major use of chlorine dioxide is as a bleach in a number of industries: in cleaning and de-tanning of leather, and as a bleaching agent for wood pulp, fats and oils, cellulose, flour, textiles, ...

Colon cancer is one of the most common cancers in the United States and cases among younger adults are rising. Early detection is critical, as symptoms may not appear until the cancer has progressed.

Royalty-free licenses let you pay once to use copyrighted images and video clips in personal and commercial projects on an ongoing basis without requiring additional payments each time you use that ...