When Annie arrives at her cousin’s farm, she finds the helicopter she wants to fly doesn’t work. In fact, it’s in pieces! Luckily, her cousin, Ed, is on hand to help rebuild it. Join them in their quest to rebuild the helicopter, and along the way discover the science of the machine and what makes it work.

WHY THINGS DON'T WORK is a series of books that present a comic story to show how machines work— from the creator of 

‘Brain Surgery for Beginners’, ‘531/2 Things that Changed the World’ and ‘Answers to Questions you Always Wanted to Ask’.