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Environmental Toxins > Half-life

The following information is about Half-life.

Half-life Defined

The time required for a radioactive substance to lose 50 percent of its activity by decay. The half-life of the radioisotope plutonium-239, for example, is about 24,000 years. Starting with a pound of plutonium-239, in 24,000 years there will be one-half pound of plutonium-239, in another 23,000 years there will be one-fourth pound, and so on. (A pound of material remains, but it gradually becomes a stable element.)

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Review: 'Mirror's Edge' Creates New Game Genre

Published November 21, 2008, 7:09 pm, Fox News

Players run, jump, crawl through virtual city -- call it a first-person runner.

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Game review: 'Mirror"™s Edge' is innovative

Published November 21, 2008, 12:51 am, The Pantagraph

Occasionally, a video game will reshape the way gamers see virtual worlds. Much like “Wolfenstein 3D,” “Super Mario 64” and “Half-Life” before it, the stunning first-person action-adventure game “Mirror’s Edge” (Electronic Arts, for the Xbox 360 and PlayStation 3, $59.99) smashes the conventions of its predecessors.

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Hands-on: Left 4 Dead Demo

Published November 17, 2008, 11:29 am, Geek.com

Left4Dead will be hitting stores November 18th, and judging from the demo and playing the game at EA’s Holiday Preview this game is bound to win awards and change the communities that Valve has created. Left4Dead is a suspense/adrenaline filled first-person experience that will not only keep players coming back for more, but will also [...]

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V-game review: 'Mirror's Edge'

Published November 16, 2008, 2:13 am, SouthtownStar

Much like "Wolfenstein 3D," "Super Mario 64" and "Half-Life" before it, the stunning first-person action-adventure game "Mirror's Edge" smashes the conventions of its predecessors.

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New video game "Mirror's Edge" is innovative

Published November 15, 2008, 3:07 pm, The Indiana Gazette

Occasionally, a video game will reshape the way gamers see virtual worlds.

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Simple graphics put focus on the action

Published November 15, 2008, 11:26 am, The Record

Faith can toss weapons and continue on her way, making Mirror's Edge a non-violent yet continually adrenaline-pumping affair. Occasionally, a video game will reshape the way gamers see virtual worlds.

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