Nina looks at different household inventions and finds out how they work. With the help of her trusty neurons she examines the items to answer children's questions. A microwave oven is a handy way to cook your food, but how does it do it? Thomas, Cariad and Joseph ask: How does a microwave oven work? With a little help from baby Bud the taste neuron and his sister Ollie, the smell neuron, Nina opens up a microwave oven in her workshop to take a closer look. She then takes the children on an adventure to see something huge that uses the same technology. If you want to learn all about invisible waves and find out how to make an invisible wave bowling game, tune in to today's episode.