Britain's High Court has ruled that the prime minister cannot trigger the U.K.'s exit from the European Union without Parliament's approval " a decision that complicates an already confusing situation riddled with uncertainties. The case, the first successful legal challenge since Britons voted in June to leave the 28-nation bloc, throws British Prime Minister Theresa May's plans for "Brexit" into turmoil because she may now have to contend with drawn-out debates in Parliament that could reveal her government's negotiating positions to EU officials. Here is what we know " and don't know " about where Brexit stands ... (full story)