During the Big Bang Theory panel at PaleyFest, Johnny Galecki, Jim Parsons, Kaley Cuoco, and Kunal Nayyar were joined on stage by show producers Chuck Lorre, Steven Molaro, Steve Holland, and Bill Prady. The biggest talking points were the forthcoming Bill Gates episode, remembering Stephen Hawking and the addition of Jerry O’Connell to the cast as Sheldon’s brother, Georgie. A clip of the Gates episode was shown and after asking how it was working with him, Galecki was…