Previously featured facts

Did you know...

 * ...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?
 * ...that the cake in Portal is a Black Forest cake that project lead Kim Swift chose at a nearby bakery?