The dry wit of the evil artificial intelligence GLaDOS, voiced with perfect acerbic delivery by actress Ellen McLain, is one of the high points of the Portal video game series. Now GLaDOS has found new purpose as a teaching tool via NASA to discuss the differences between nuclear fusion and fission energy, with McLain returning to provide the distinctive voice. Make no mistake about it, even though this is about learning, GLaDOS is still very much evil!

Check out the full video below.