I was shopping on Amazon for a potty training book for our 2 1/2 year old grandson--Even Firemen Go to the Potty. And the site recommended another book that people like too. The title intrigued me -- The Gas We Pass: The Story of Farts. The reviews were positive saying it was both funny and educational. I ordered it, but decided it was a little too complicated for the younger grandson to comprehend. Bright idea--Make it a Father's Day gift to son-in-law and the boys. My daughter says the book was the hit of the day!