Why is the sea salty? How far away is space? Why can't I tickle myself? Why can't we live forever? Children ask the most interesting and challenging questions. But how are we supposed to answer them...? At last! Expert answers to those big questions children ask, with help from: Sir David Attenborough,Heston Blumenthal, Kate Humble, Alain de Botton, Philip Pullman, Dr Richard Dawkins, Bear Grylls, Dame Jacqueline Wilson, Jarvis Cocker, Dame Kelly Holmes, Noam Chomsky, Jessica Ennis, Derren Brown, Miranda Hart, Tracey Emin, Harry Hill, A C Grayling, Dr Christian Jessen and many more!