What channel is known for running 'Shark Week' each summer?

Which 'Saturday Night Live' cast member famously played "Church Lady"? Which 'Saturday Night Live' sketch introduced Wayne and Garth? Which 'SNL' cast members played the Blues Brothers? Which comedian starred as a fictionalized version of himself in 'Louie'? Which network airs the long-running series 'Pawn Stars'? Which long-running PBS series appraises antiques brought in by the public? Which Discovery series follows crab fishermen in the Bering Sea? Which Discovery series tested myths with Adam Savage and Jamie Hyneman?