When Leonard and Howard find out that Sheldon worked with the military behind their backs, they are furious and ask Kripke to help them, much to Sheldon's annoyance. Meanwhile, Bernadette asks Raj to see if Ruchi is trying to steal her job.
Did You Know?
Sheldon says that sonar is based on bats, but sonar is for marine use: bats use echolocation, which is a similar yet separate biological mechanism. See more
You know, maybe you're all more like the guy who didn't invent the electric car and less like the guy who didn't invent the light bulb.
She's right. Maybe we're all a bunch of Teslas after all.
Amy Farrah Fowler
Didn't Tesla die penniless, forgotten and insane?
You may have a point about her social skills.
He wasn't insane.
He did fall in love with a pigeon.
Well, if we're gonna call Tesla crazy for loving something small and unappealing, might as well put Penny in a padded cell right now.
History of Everything (Instrumental version)
Written by Barenaked Ladies
Performed by Barenaked Ladies
[Instrumental version of series theme song played over the closing credits] See more