In this bubbling episode, beautiful Belle, the sound neuron, helps Nina as they take a good look inside a kettle. They then leave the workshop to see something with very big chimneys that uses the same science. This episode is all about thermostats and we finish off by making a thermostat of our very own!

Originally released by BBC Worldwide Learning, 2009. Streaming video file encoded with permission for digital streaming by Infobase on September 22, 2020.