Leonard and Sheldon have no idea where physics is going next. The Big Bang Theory S11E02 - The Retraction Reaction episode. Follow us on Instagram: Shelly&Penny: https://www.instagram.com/Shelly_Penny_/ #ShellyandPenny #KaleyCuoco #TBBT DISCLAIMER: Some of the links in description may be affiliate links. This means that if you click on one of the links and make a purchase, I may receive a commission (at no extra charge to you).