On Saturday, July 7th, 2012, the Olympic flame arrived in Cambridge. Held by a runner in the specially designed Olympic torch, it approached the city centre along streets lined with over 8,000 cheering spectators. The flame then spent two days in Cambridge – days 50 and 51 of a 70-day tour of the UK. This tour, called the Olympic Torch Relay, is an important part of the build-up to the Olympic Games. (The opening ceremony is on Friday, 27th July.) So what is the Olympic Torch Relay and why is it done?