New Scientist Live is a festival of ideas and discovery, taking place at ExCeL London from 28 September to 1 October. Rooted in the biggest, best and most provocative science, New Scientist Live will touch on all areas of human life. On Thursday Helen will tell us 'We need to talk about physics'.  And Helen will be there on Sunday with Robin, Lucie and Matt in Cosmic Shambles Live - an explosion of science, comedy, music and general wonder.