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 If you like pulling faces at yourself in the mirror, then you're not alone. Ciara, Morgan and Rachel like this game so much they have decided to ask Nina: How does a mirror work? This episode is double the fun as Nina shows the girls what a mirror is made of and how it reflects. With the help of lovely Luke, Nina and the girls set off to see a beautiful invention that uses mirrors at night. This shiny episode is all about refection and today we will be finding out how to make our very own mirror.