Across a gorgeous, sun-drenched summer holiday more than forty children of 4 and 5 years old converge on a brand new inner-city school that is rigged with cameras and wired for sound. This year a new raft of specially designed games will test everything from the children’s ability to handle a one day old chick, to their willingness to take risks, to seeing how well they can resist a 5-tier chocolate fountain. And this time, as well as giving insight into the children’s behaviour, our scientists -- Professor Paul Howard-Jones, Dr Sam Wass, Dr Elizabeth Kilbey and Dr Alison Pike -- also consider what may be going on inside their brains.