Who played Barney Stinson in 'How I Met Your Mother'?

Who played Sheldon Cooper in 'The Big Bang Theory'? Which 'The Big Bang Theory' spin-off follows Sheldon's childhood in Texas? In 'How I Met Your Mother', who is the narrator telling the story to his kids? In 'How I Met Your Mother', which character's catchphrase is "Legendary"? In 'Parks and Recreation', in which fictional Indiana town is the show set? Who played Leslie Knope in 'Parks and Recreation'? Which 'Parks and Recreation' character loves breakfast food and woodworking? In '30 Rock', which network's comedy show is the series about?