Our lives are filled with loops that hurt us, heal us, make us laugh, and, sometimes, leave us wanting more. This hour, Radiolab revisits the strange things that emerge when something happens, then happens again, and again, and again, and again, and again, and… well, again. In this episode of Radiolab, Jad and Robert try to explain an inexplicable comedy act, listen to a loop that literally dies in your ear, and they learn about a loop that sent a shudder up the collective spine of mathematicians everywhere. Finally, they talk to a woman who got to watch herself think the thought that she was watching herself think the thought that she was watching herself think the thought that ... you get the point. With Kristen Schaal and Kurt Braunohler,  Alex Bellos, Steven Strogatz, Janna Levin, and Melanie Thernstrom. Plus mind-bending musical accompaniment from Laguardia Arts High School singers Nathaniel Sabat, Julian Soto, Eli Greenhoe, Kelly Efthimiu, Julia Egan, and Ruby Froom. You can find the video Christine Campbell made of her mom Mary Sue here. Support Radiolab today at Radiolab.org/donate.