Nina investigates how cranes work - with the help of Luke, her sight neuron. Engineers Blossom and Kah Weng visit Nina in her workshop and discover that cranes can lift really heavy things, but they need to be balanced so they don't fall over. Next they visit the Titan Crane in Glasgow to see a big crane up close. Back in the workshop they balance on Nina's seesaw. They find out that cranes can balance different weights by moving them along their arm. Show less