Balloon From Wikipedia, the free encyclopedia Jump to: navigation, search For other uses, see Balloon (disambiguation). Balloons, like greeting cards or flowers, are given for special occasions.A balloon is a flexible bag normally filled with a gas, such as helium, hydrogen, nitrous oxide or air. Some balloons are purely decorative, others are used for specific purposes. Early balloons were made of dried animal bladders. Modern balloons can be made from materials such as rubber, latex, chloroprene or a nylon fabric. A balloon's unique properties including its low density and relatively low cost have lead to a wide range of applications. Contents 1 Etymology 2 History 3 Applications 3.1 Decoration or entertainment 3.1.1 Balloon modeling and balloons in art 3.1.2 Water balloons 3.1.3 Rocket balloons
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Race From Wikipedia, the free encyclopedia Jump to: navigation, search The neutrality of this article is disputed. Please see the discussion on the talk page. This article concerns the term 'race' as used in reference to human beings. For other uses, including in biology and for athletics events and other speed competitions, see Race (disambiguation). The term race describes populations or groups of people distinguished by different sets of characteristics, and beliefs about common ancestry. The most widely used human racial categories are based on visible traits (especially skin color, facial features and hair texture), and self-identification. Conceptions of race, as well as specific ways of grouping races, vary by culture and over time, and are often controversial for scientific as well as social and political reasons. Many scientists contend that while the features on which a racial categorizations are made may be based on genetic factors, the idea of race itself, and actual divisions of persons into groups based on selected hereditary features, are social constructs. Since the 1940s, some evolutionary scientists have rejected the view of race as a biologically meaningful concept. A majority of evolutionary scientists reject the notion that any definition of race pertaining to humans can have any taxonomic rigour and validity. Mainstream scientists have argued that race definitions are imprecise, arbitrary, derived from custom, have many exceptions, have many gradations, and that the numbers of races observed vary according to the culture examined. They further ma
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