Have you ever wondered what’s inside the machines you use so often in your daily life? How can a mechanical watch keep perfect time, without a battery? What whips up a storm inside a toilet to deliver a spotless flush? And how does a yoyo do tricks that defy gravity? Using ultra-realisitic CGI animation, this episode ‘explodes open’ everyday machines into their individual parts, to reveal their secret workings. Combined with stunning footage from the factories where these objects are designed, built and tested, this compelling program uncovers the mysteries of machines and how they work.