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 * ...that GLaDOS' voice actor,, also voices The Administrator in Team Fortress 2 and the Overwatch in the Half Life 2 series?
 * ...that GLaDOS stands for Genetic Lifeform and Disk Operating System?
 * ...that Ellen McLain is also an opera singer and sang the ?
 * ...that Valve employee Richard Lord was the original, placeholder 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?
 * ...that the cake in Portal is a Black Forest cake that project lead Kim Swift chose at a nearby bakery?