The Olympics in Paris officially begins with a unique show in the middle of the Seine on Friday and France has big – and mysterious – plans for the pompous opening ceremony. What’s special about the opening ceremony? For the first time in Summer Games history, the opening ceremony won’t be held in a stadium. Instead, the more than 200 national delegations will sail across the Seine through the centre of Paris and past sights such as the Notre-Dame Cathedral, the Louvre and the Musée d’Orsay. How does the ceremony work? The parade of athletes will start at 7:30 pm (1730 GMT) at the Pont d’Auste…