Students will use Sphero to explore the computer science concepts of variables and conditionals (ifstatements). They will use OrbBasic, which is a text-based programming language for the Sphero. They will write a simple program that rolls Sphero in a circle until it gets an error. Then they will fix the errorby adding an if/then statement. They will learn about if/then/else statements to light up Sphero under certain conditions. For the challenge, they will make the circle increase its radius each time it goes around a circle.