Minecraft is a game based on cubes, what you likely already knew. It's made by Markus 'Notch' Persson and has now as leadong developer Jens Bergensten.
feed the beast is a 'mod'(modification), an expansion for minecraft wich add plenty of new stuff.
For more basic information about minecraft please visit http://www.minecraftwiki.net/wiki/Minecraft or http://en.wikipedia.org/wiki/Minecraft
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