[Oblivious as usual to the effect he's having on Don, Robert just flips the textbook open and leafs through its pages until he arrives at the introduction.]

"The real world is exceedingly complex: one goal of an engineer... is to be able to model or simulate the real world in such a way that the actual device need not be fabricated, but that the device may be... simulated using computer programs."

[His reading is fairly steady, at the least?]