Watch this classic "Penny Solves String Theory" clip from the comedy series The Big Bang Theory, created by Chuck and Lorre Bill Prady.
The Big Bang Theory Cast: Johnny Galecki, Jim Parsons, Kaley Cuoco, Simon Helberg, Kunal Nayyar, Sara Gilbert, Mayim Bialik, Melissa Rauch, Kevin Sussman and Laura Spencer Stream The Big Bang Theory now on Max!