That's so weird. They could easily have gotten some actual people from CalTech (the university Sheldon/Leonard/etc all work) to come in and write up some stuff for them to have in the background. But television people are just so lazy sometimes.
I've seen shows where they'll have the "korean" couple speaking chinese and expect you not to notice. How hard would it have been to get some actual Korean dialogue? Damn. There was an episode of Desperate Housewives recently with some italian dialogue and according to Italian speakers, the phrase they used made no sense. So lazy!