Wolowitz and Sheldon bond when they drive to the desert to shoot off a model rocket. Also, when Leonard's mom finds a new best friend in Penny, it rubs Leonard the wrong way.
As Sheldon stresses about picking a wedding date, Amy tries to convince him he has a more laid-back side. Also, Koothrappali and Stuart compete to win the heart of Bernadette's new co-worker, Ruchi.
Leonard angers the university – and the entire physics community – after he gives an embarrassing interview. Also, Amy and Bernadette bond over having to hide their success from Sheldon and Howard.
In the eleventh season opener, Amy gives Sheldon an answer to his proposal while Howard and Bernadette struggle with some unexpected news.