Can a frozen body be shattered with a hammer, how can speedbumps diagnose appendictis and why are reindeers' noses red? For Christmas 2012 we talk to a host of scientists doing seasonal research, find out how Elite, the blockbuster computer game launched 30 years ago, is about to make a comeback, and answer your brain-busting science questions, including why chewing gum gets tougher the longer you chew it, and we do the experiment to discover whether James Bond really could freeze - then shatter - a baddie...