Whether it's walking, talking, breathing, growing, eating or excreting, your body has a LOT going on. But how does it do it? What's really going on in there? Lift the flaps to find out!

Matthew writes books for Usborne about all sorts of subjects, including history, science and Planet Earth. Before he did this, he studied English at university and worked for the BBC where he made funny radio programmes. In his spare time he likes to ride his bike, visit all kinds of museums and read on his sofa as much as possible.