For seven seasons Dr. David Saltzberg has made sure the science on the CBS sitcom The Big Bang Theory is correct. As science consultant for the show he reviews scripts for technical errors, fixing any problems he finds. He also adds complex formulae to whiteboards on set. Before his life as a science advisor, Saltzberg received his Ph.D. in physics from the University of Chicago, performed post-graduate work at CERN, and currently is a Professor of Physics and Astronomy at UCLA. He writes The Big Blog Theory, where he explains the science behind each episode of the show. Dr. Saltzberg has agreed to answer any questions you have about the show or his previous scientific work. As usual, ask as many as you'd like, but please, one per post.