This video of a squirrel riding a mini motorcycle through a maze is the action-packed content I never knew I needed. Go, squirrel, go! Who knew rodents had such a knack for extreme sports? Speaking of extreme, Mount Everest is technically not the tallest mountain in the world if we're talking about the distance from its base to its summit. Mauna Kea in Hawaii is taller when measured from its underwater base to its peak.