From Raj and Penny to Leonard and Sheldon, we ranked the best duos from the iconic sitcom, The Big Bang Theory.

The Big Bang Theory ended without confirming Penny's last name, but as it turns out, the sitcom already secretly revealed it back in season 2!

From Penny and Sheldon to supporting stars like Beverly and Mary Cooper, all The Big Bang Theory's heroes have one line that truly sums them up.

As ‘The Big Bang Theory’ progresses, Bernadette helps the characters in more than one way. Not only did she solve the Howard equation but also helped Penny find a job in her pharmaceutical ...

On The Official Big Bang Theory Podcast, Chuck Lorre said that Kaley Cuoco's Penny wasn't fully developed in the earlier seasons of the show.