This show keeps getting better and better. Monday’s episode, in which Penny plays nurse to a sick Sheldon after Leonard and his friends hide out, was the funniest so far. From the opening 3-D chess game to Chuck Lorre’s 200th vanity card that ended the episode. Terrific acting, with the supporting characters blending nicely into the story. Great lines and gags. Kaley Cuaoco, gorgeous and funny, balances the nerdfest. (BTW, she’s can’t be a waitress at the Cheesecake Factory because she doesn’t wear a tie, against the dress code, just ask Caitlin, my favorite real Cheesecake Factory waitress at the Burlington mall.) If you’re not watching Big Bang, get caught up online.