Ten of the country's most passionate know-it-alls are put to the test to find out who really is the brightest of the bunch in ``Canada's Greatest Know-It-All.'' Host Daniel Fathers presents the competitors with a wide range of challenges designed to test their knowledge, cooperation, leadership and problem-solving skills that require not only brain power, but physical ability as well. The challenges combine street smarts and book smarts, common sense and theory, and they all come with their own little twist. Each episode presents the contestants with several challenges, and the person with the fewest points after the final surprise elimination challenge leaves the show. In the end, only one will be crowned Canada's ultimate Know-It-All King or Queen.