From crazy bodily functions to bizarre real-life medical cases, read the most fascinating facts and disgusting did-you-knows in Operation Ouch!: The HuManual.
Sign up to the Puffin newsletter
Stories, ideas and giveaways to help you spark young imaginations
By signing up, I confirm that I'm over 16. To find out what personal data we collect and how we use it, please visit our Privacy Policy
