cal tech department of applied physics. you may be familiar with some of my work. it's currently orbiting jupiter's largest moon taking high-resolution digital photographs. >> penny. i work at the cheesecake factory. >> but then, they bring in bernadette and they bring in amy fowler. and so, suddenly, there is like a bunch of women and the show felt much more balanced as a result. >> i am amy fowler. you are sheldon cooper. >> hello, amy farrah fowler. >> she eventually became sheldon's love interest and of course that opened up a whole other pandora's box. >> may i ask you a question before i gave it to you? >> of course. >> why are we saying give it to you like that? >> at the beginning, sheldon is an outcast, an intellectual, a geek. by the end, he's found his soulmate, he has friends. he's won a nobel prize. >> i have been encouraged, sustained, inspired, and