From the record-breaking, Number One bestselling author of KAY’S ANATOMY comes the funniest, most fact-filled and most disgusting activity book about the body ever written! This new Adam Kay activity book contains over 500 hilarious, disgusting activities – codes to crack, experiments, recipes and more, including 144 all-new “True or Poo” quiz questions! Do you know your patella from your paella? Have you ever tasted phlegm soup? Want to learn how to bunk off school with a fake plaster cast? It’s guaranteed to challenge, entertain and revolt readers aged 7 to 739. Adam Kay’s children’s books have been translated into 32 languages and sold over 1 million copies, making him one of the UK’s bestselling children’s authors. Kay’s Anatomy became the fastest-selling children’s general non-fiction hardback of the decade and his first children’s novel, Dexter Procter the 10-Year-Old Doctor, was the No. 1 children’s hardback fiction debut of 2025. Praise for Kay’s Anatomy: ‘An enjoyably gross look at the human body. Hours of gruesome fun guaranteed’ i ‘Like listening to a teacher who makes pupils fall about’ Sunday Times ‘Totally brilliant!’ Jacqueline Wilson ‘Fun and informative’ Malorie Blackman ‘Very funny – this exciting book is bound to inspire the next generation of medics’ Sunday Express Praise for Kay’s Marvellous Medicine: ‘A ridiculously funny read that will delight, gross out and educate all at the same time’ Independent ‘Educational and entertaining. It should be on the national curriculum!’ Harry Hill ‘Completely marvellous and very funny’ BookTrust