Baroness Greenfield, the well known neuroscientist and director of the Royal Institution, has joined the likes of Nicole Kidman and Chris Tarrant by putting her name to a computer game designed to train the brain. ** Train your brain: Take the MindFit test At the House of Lords she helped to launch a new fitness routine to play on the insecurities of the masses - the brain workout - and described the results of a trial that suggests that it could help arrest the ageing of the body's most complex organ. "You are your brain and it is vital your...