My favourite series is The Big Bang Theory. It is an American sitcom created by Chuck Lorre and Bill Prady. Main actors are Johnny Galecki as Leonard Hofstadter and Jim Parsons as Sheldon Cooper. Leonard and Sheldon are roommates and physicists employed at the California Institute of Technology. Penny is a waitress and aspiring actress, and later Leonard's girlfriend , who lives across the hall. Leonard's and Sheldon's equally geeky friends are aerospace engineer Howard Wolowitz and astrophysicist Rajesh Koothrappali. All of them are funny and very different persons. Rajesh is uncomfortable in women company , Howard always wears polo shirt and tight clothes , Penny is a little less intelligent person, so she sometimes doesn't fit into their society , Leonard likes comics very much , and Sheldon... Sheldon thinks he is the smartest, most beautiful and most handsome guy and everything has to be as he says . I really like this sitcom because it is very funny and instructive, in some strange form, and I would recommend it to everyone who wants to laugh a lot.