Blue tooth

Blue tooth is an industrial requirement for wireless personal area networks.Blue tooth provides a way to connect and swap information between devices such as mobile phones, laptops, PCs, printers, digital cameras, and video game consoles over a secure, globally unlicensed short-range radio frequency. The Blue tooth specifications are licensed and developed by the Blue tooth Special Interest Group.

Blue tooth is a radio standard and communications protocol mostly designed for low power consumption, with a short range based on low-cost transceiver microchips in each device. The devices use a radio communications system, so they do not have to be in line of view of each other, and can even be in other rooms, as long as the conservative transmission is powerful enough.

Hockey

Hockey is any of a family of sports in which two teams struggle by trying to maneuver a ball, or a hard, surrounding disc called a puck, into the opponent's net or goal, using a hockey stick. Field hockey is played on nettle, natural grass, sand-based or water-based artificial turfs, with a small, hard ball. The game is popular among both males and females in many countries of the world, mostly in Europe, India, Pakistan, Australia, New Zealand, South Africa and South Asia. In most countries, the game is played between single-sex sides, even though it can be played by mixed-sex sides. In the United States and Canada it is played mostly by women. Ball hockey is played in a gym using sticks and a ball, often a tennis ball with the hair removed.

There are early representations and reports of hockey-type games being played on ice in the Netherlands, and reports from Canada from the beginning of the nineteenth century, but the modern game was initially planned by students at McGill University, Montreal in 1875 who, by two years later, codified the first set of ice hockey rules and organized the first teams.

Race

The term race describes populations or groups of people well-known by different sets of characteristics, and beliefs about common ancestry. The most broadly used human racial categories are based on visible traits, and self-identification. Conceptions of race, as well as specific ways of grouping races, vary by culture and over time, and are often contentious for scientific as well as social and political reasons. Many scientists contend that while the features on which a racial categorization 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 impression. 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 definition are imprecise, arbitrary, derived from custom, have many exceptions, have many gradations, and that the numbers of races experimental vary according to the culture examined. They further preserve that race as such is best understood as a social construct.