About this programme
Nina investigates how a bin lorry works - with the help of Ollie, her smell neuron. Engineers Heidi, Molly and Sam visit Nina in her workshop and discover that bin lorries use pistons to lift up the rubbish bins. Next they go to a recycling centre and find out that pistons are tubes connected with liquid. Lastly they visit the Thames Barrier which protects London from flooding. The Thames Barrier is really heavy and works using pistons too.