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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 sang the Turret Opera?
...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?

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...that the cake is a Blackforest cake, a culinary speciality from south Germany?

...that Valve's webcomic Lab Rat explains Chell's survival?

...that Portal's main character was originally going to be a man?

...that Portal 2's co-op mode was originally supposed to feature Chell and a second woman called Mel?

...that Rat man can be heard in Portal 2?

...that defective defective turrets may still be dangerous?[1]

...that Rat man hinted to be alive during Portal 2 outro?

...that Portal 2 concept missed Chell, GLaDOS and portals themselves?

...that Portal 2 take place several hundreds years after events of Portal from the words of Valve employee?

...that there's a third unidentified person in the background of the Caroline portrait?

...that the Portal 2 preview at E3 2010 showed a testing element called Pneumatic Diversity Vent that didn't make it to the game's final version?

...that the hoop that falls out of the sky in the end of Portal was intended to be a meme by the developers, instead of the cake or the Companion Cube ? [2]

...that there is a interactive trailer for Super 8 in Portal 2?

...that GLaDOS was intended to speak voice lines of Announcer in first chapter of Portal 2?

...that Ellen McLain favors GLaDOS over all other characters she has portrayed in Valve games?

...that the Hover Turret was going to be a personality core-based turret?

...that the Portal 2 was originally going to be a Prequel, with no Chell, Glados or Portals?

...that the Animal King Turret was planned to marry off one of its turrets to Chell? [3]

...that there were also plans for "reflection gel" in Portal 2?

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