Have you ever wondered? Only a small part of crude oil is petrol, so how do we make enough for all the cars in the world? Food labels give ‘total fat’ and ‘saturated fat’ — but what’s the difference? How is plastic made from oil? How do those plastic creatures, that grow when put in water, actually work? How do you make slime/super-balls? Why would you want a biodegradable plastic bag? Is sucking plastic toys dangerous for a baby? How do chemists discover new drugs?