“The science part is extremely easy as far as being able to tell you why it's authentic. We employ David Saltzberg, who is a physicist who teaches at UCLA. He not only fact-checks, but he supplies a great deal of [the material]. We need Sheldon to talk about something or teaching Penny whatever and [Salzberg will] come up with something. He sends over this diagram on this white board and he'll throw in little inside jokes that I don't find funny because I don't know what the heck he's talking about.”