No doubt about it, it's a cold world out there. But that's no problem for three brothers in Markham, Ontario. As the founders of frozen yogurt giant Yogen Früz Worldwide Inc., Aaron, Michael and Simon Serruya are heaping up cool profits the world over--in 81 countries, to be exact. In October, the brothers were named Young Entrepreneurs of the Year for Canada. And as if that weren't enough, for the second year running, these entrepreneurs have secured the number-three spot in Entrepreneur's annual Franchise 500®. So what's the scoop? Theirs is truly a story of sweet success.