Big Bang Theory, a popular American television sitcom, follows the lives of a group of nerdy friends who work as physicists and engineers. The show features a lot of geeky references, science humor, and pop culture trivia. Some of the keywords that may be associated with the show include Sheldon Cooper, Leonard Hofstadter, Penny, Raj Koothrappali, Howard Wolowitz, science, comedy, friendship, sitcom, and nerd culture.