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Documentation for Did you know/list

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...that GLaDOS', Turrets' and Caroline's voice actor, Ellen McLain, 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 performed the Turret Opera?
...that Valve employee Richard Lord was the original placeholder voice for Wheatley?
...that there were plans for "sticky gel" in Portal 2?
...that both Portal and Portal 2 were inspired by ideas from prototypes created by Digipen students?
...that the cake in Portal is a Black Forest cake chosen by project lead Kim Swift at a nearby bakery?
...that the cake is a lie?
...that the webcomic Portal 2: Lab Rat explains how Chell survived?
...that in the Portal Steam trailer, the player character appears to be male?
...that Portal 2's co-op mode was once planned to feature Chell and another human named Mel?
...that Doug Rattmann can seemingly be heard rambling in Ghost of Rattman?
...that an unused testing element called the Pneumatic Diversity Vent was shown at E3 2010?
...that the PC version of Portal 2 includes an interactive trailer for the movie Super 8?
...that pre-recorded messages of GLaDOS originally took the place of the Announcer's voice lines in the first chapter of Portal 2?
...that Ellen McLain has said GLaDOS is her favourite Valve character she's portrayed?
...that there is a cut type of turret called the Hover Turret which looked like a personality core?
...that Portal 2 was at one point planned as a prequel without Chell, GLaDOS, or portals?
...that the Animal King Turret was planned to marry off one of its turrets to Chell?[1]
...that there were plans for a "reflection gel" in Peer Review?
...that Chell was once planned to speak in Portal 2's ending sequence?
...that in the Perpetual Testing Initiative video, someone is watching Meet the Pyro instead of building a test chamber?
...that all test chambers in the Portal 2 Sixense MotionPack DLC were created by just two developers, Danny Woodall and Chip Sbrogna?[2]

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