A teenager who stabbed three young girls to death at a Taylor Swift-themed dance class in England was sentenced Thursday to more than 50 years in prison for what a judge called "the most extreme, shocking and exceptionally serious crime." Judge Julian Goose said 18-year-old Axel Rudakubana "wanted to try and carry out mass murder of innocent, happy young girls." Goose said that he couldn't impose a sentence of life without parole, because Rudakubana was under 18 when he committed the crime. But the judge said he must serve 52 years, minus the six months he's been in custody, before...