From the sun outside to lamps we use at night, light surrounds us every day. Learn how shadows are made and discover how light interacts with objects with friends from Sesame Street. About the Sesame Street ® World of Science series: Explore the wonderful world of science! Ernie, Big Bird, and the rest of your Sesame Street friends make key science concepts like color, light and shadow, and states of matter accessible and engaging for young learners.