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 Friends Robyn, Nadine and Caoimhe ask Nina: How does our vacuum cleaner suck up dirt from the floor? With help from fabulous Felix, she looks inside a vacuum cleaner and discovers the science behind it. Nina then takes the girls on a trip to an airport to see another invention that uses the same technology. In this windy episode we learn all about fans and discover how to invent a vacuum cleaner of our very own.