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 * ...that the voice for GLaDOS is Ellen McLain, the same voice for the Administrator from Team Fortress 2?
 * ...that GLaDOS stands for Genetic Lifeform and Disk Operating System?
 * ...that Ellen McLain (the voice of GLaDOS) is also an opera singer?
 * ...that Valve employee Richard Lord was the original voice for Wheatley?
 * ...that Portal 2 originally wasn't going to have portals?
 * ...that there were plans for "sticky gel" in Portal 2?
 * ...that both Portal and Portal 2 derived many of their ideas from prototypes made by Digipen students?