My thanks to the nice people at Collins for sending the book.
If they really don't like reading fiction, you could also try the Science Museum's offering [[Why Is Snot Green]] and [[Crimebusters]] by Clive Gifford. You might also gain something from [[Six Days Inside A Mountain by Louane K Beyer]].
{{toptentext|list=Top Ten Books For Children Who Think That Farts Are Funny}}