High Quality Content by WIKIPEDIA articles! In chemistry, radicals (often referred to as free radicals) are atoms, molecules, or ions with unpaired electrons on an open shell configuration. The unpaired electrons cause them to be highly chemically reactive. Radicals play an important role in combustion, atmospheric chemistry, polymerization, plasma chemistry, biochemistry, and many other chemical processes, including human physiology. For example, superoxide and nitric oxide regulate many biological processes, such as controlling vascular tone. "Radical" and "free radical" are frequently used interchangeably, although a radical may be trapped within a solvent cage or be otherwise bound. The first organic free radical identified was triphenylmethyl radical, by Moses Gomberg in 1900 at the University of Michigan.

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High Quality Content by WIKIPEDIA articles! The sex-positive movement is a loosely defined term that applies to a wide variety of elements that embrace social and philosophical attitudes promoting open sexuality with few limits. The terms and concept of sex-positive or, alternately sex-affirmative and sex-negative are generally attributed to Wilhelm Reich. His hypothesis was that some societies view sexual expression as essentially good and healthy, while other societies take an overall negative view of sexuality and seek to repress and control the sex drive.

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