Our sense of sight depends on light but what is light Is it something solid Where does it come from Find out the answers to these questions as well as others you have probably wondered about such as whether invisibility cloaks are a real possibility.STEM stands for science technology engineering and mathematics and it is not just for scientists. The existence of the whole Universe including us and our daily lives can all be described with the wonderful scientific facts that make up the topics included in STEM. In this series you will find out how easy STEM is to understand and also discover how you can see it in action every second of every day.