Guest hosts Daniel Engber and David Epstein talk with Carl Bialik about robot line judges in tennis, Mike Pesca joins for a review of NBA tanking, and Florentina Hettinga discusses the science of the Paralympics. Robot umpires (1:47): Carl Bialik discusses the latest innovation in line-calling technology and how it might affect tennis. Tanking (18:25): Hang Up host emeritus Mike Pesca chats about why there’s more tanking than ever in the NBA and what might be done about it. Paralympics (36:09): Sports scientist Florentina Hettinga sheds light on debates over classification in the world of disability sports. Afterballs (45:39):Learn more about your ad choices. Visit megaphone.fm/adchoices