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 Hil;l A C Grayling; Dr Christian Jessen and many more!