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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?