For the third time in two months, the U.K. will soon have a new prime minister. And now, Boris Johnson — the man who was the prime minister just 47 days ago — has withdrawn from the nation's leadership race. In Canada, there's growing frustration from leaders in the prairies, who are pushing for sovereignty. Alberta's new Premier Danielle Smith has promised to keep the federal government out of provincial politics, and Saskatchewan Premier Scott Moe said he'd follow suit. Plus, could we be seeing the beginnings of a global polio resurgence?