Discovery Channel's ''Canada's Greatest Know-It-All'' returns for its second season with 10 new contestants and 23 challenges. Returning host Daniel Fathers will put the players to the test in a supersized arena of grit and wit. In each episode, the contestants compete with and against each other in challenges that test their knowledge, problem-solving skills, leadership, cooperation and strategy. The player with the fewest points after each final elimination challenge is sent home. Each of these self-proclaimed know-it-alls is on a quest to earn the title of Canada's Greatest Know-It-All.