From today's featured articleSonic X-treme was a platform game developed by Sega Technical Institute from 1994 until its cancellation in 1996. It was intended to be the first fully 3D Sonic the Hedgehog game and the first original Sonic game for the Sega Saturn (pictured). The game was conceived as a side-scrolling platform game for the Sega Genesis to succeed 1994's Sonic & Knuckles. Development shifted to the 32X and then the Saturn and Microsoft Windows, and the game was redesigned as a 3D platform game for the 1996 holiday season. The plan was disrupted by illness, company politics, and an unfavorable visit by Sega executives. In place of X-treme, Sega released a port of the Genesis game Sonic 3D Blast, but did not release an original 3D Sonic platform game until Sonic Adventure for the Dreamcast in 1998. The cancellation is considered an important factor in the Saturn's commercial failure, as it left the system with no original platform game featuring Sega's mascot. (Full article...)
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On this daySeptember 13: Feast day of Saint John Chrysostom (Western Christianity)
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The Human Development Index of 189 countries is compiled by the United Nations Development Programme (UNDP) in the annual Human Development Report. The index considers the health, education and income in a given country to provide a measure of human development which is comparable between countries and over time. The Human Development Index (HDI) was first published in 1990 with the goal of being a more comprehensive measure of human development than purely economic measures such as gross domestic product. The index incorporates three dimensions of human development: a long and healthy life, knowledge, and decent living standards. Various indicators are used to quantify how countries perform on each dimension. The indicators are used to create a health index, an education index and an income index each with a value between 0 and 1 which are combined to create the HDI. The data used to calculate HDI comes mostly from United Nations agencies and international institutions. The HDI is the most widely used indicator of human development and changed how people view the concept. (Full list...)
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Total internal reflection is the optical phenomenon in which light waves are completely reflected under certain conditions when they arrive at the boundary between one medium and another. This photograph was taken from near the bottom of the shallow end of a swimming pool. The swimmer has disturbed the water surface above her, scrambling the lower half of her reflection, and distorting the reflection of the ladder. Most of the surface is still calm, giving a clear reflection of the tiled bottom of the pool. The air above the water is not visible except at the top of the frame where the angle of incidence of light waves is less than the critical angle and therefore total internal reflection has not occurred. Photograph credit: Jean-Marc Kuffer
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