RATED 14+. Bear Grylls is in Arizona, land of the Apache, showing how to survive in its 100,000 square miles of scorching deserts and freezing mountains.

Ten people, who have been called the biggest know-it-alls by their family, friends and coworkers, compete in a series of diverse and head-scratching challenges to find out who is Canada's Greatest Know-It-All.

RATED 14+. Nigeria Airways Flight #2120 takes off from Saudi Arabia's Jeddah airport, headed for Nigeria, but the pilots get a warning that their plane is not properly pressurizing; while trying to return to the airport, the plane erupts in a fireball.

Adam and Jamie explore the 100-year-old conundrum that, if blindfolded, can humans travel in a straight line?; Kari, Grant and Tory test binary explosives - would they explode in the case of a fender bender?

Bryan and Tim hunt through abandoned buildings in downtown Tampa for an urban feral hog; Josh and Krystal track a pack of hogs that have destroyed a farmhouse in Texas; Dr. West and Renee chase a Hawaiian hog into its volcanic lava lair.