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Cheerleading is a physical activity, sometimes a competitive sport, using organized routines, usually ranging from one to three minutes, which contain the components of tumbling, dance, jumps, cheers, and stunting to direct spectators of events to cheer on sports teams at games or to participate in competitions. The person involved is called a cheerleader. Cheerleading originated in the United States, and remains a predominantly American activity, with an estimated 1...

The Arctic is the region around the Earth's North Pole, opposite the Antarctic region around the South Pole. The Arctic includes the Arctic Ocean (which overlies the North Pole) and parts of Canada, Greenland (a territory of Denmark), Russia, the United States (Alaska), Iceland, Norway, Sweden and Finland. The word Arctic comes from the Greek αρκτικός (arktikos), "near the Bear, arctic, northern" and that from the word άρκτος (arktos), which means bear...

The London Marathon is a charity road marathon that has been held each spring in London since 1981. The race is currently sponsored by Virgin, as the Virgin London Marathon. Previously the event was sponsored by Flora (from 1996 to 2009). The 2010 London Marathon, the thirtieth race, took place on Sunday, 25 April 2010. In addition to being one of the top five international marathons run over the traditional distance of 42...

In image processing, computer graphics, and photography, high dynamic range imaging (HDRI or just HDR) is a set of techniques that allow a greater dynamic range of luminance between the lightest and darkest areas of an image than current standard digital imaging techniques or photographic methods. This wide dynamic range allows HDR images to more accurately represent the range of intensity levels found in real scenes, ranging from direct sunlight to faint starlight...