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Ikepedia is the officially decreed successor to Gammapedia concerning Gammasphere canon.
Infinitypedia is another successor.
Nothing
Nothing is someting that does not exist. Not even as an idea. It is zero. Zilch. Diddly goddamn squat. It does have some interesting properties, however. For example, if you eat it, you will lose weight (and lots of other important body stuff). A while after that, you will die. But it isn't poisonous. Also, if you were to fall in love with it, you would not be breaking the Golden Rule. Very strange indeed. Which in the Gammaverse, is completely normal, thus causing a paradox, so the universe exploded. Everybody in the Gammaverse just laughed at the universians.