Nina and fabulous Felix, the touch neuron, show the girls the science of bounciness by opening up a mattress in Nina's super-cool workshop and then taking a very exciting journey to see some truly monstrous inventions. In this bouncy episode we learn all about springs and even invent our very own spring-filled mattress.

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