Kaley Cuoco-Sweeting gets honored with a star on the Hollywood Walk of Fame. Browse photos from the amazing event.
The guys try to help Penny out of an awkward work dilemma. Meanwhile, Amy and Bernadette argue over whether or not female scientists should play up their sexuality.
Sheldon and Raj test whether they could survive a dark-matter research expedition in a salt mine by simulating the conditions in a steam tunnel.