Red Kangaroo sees a rainbow across the sky and wants to know: where does it come from? Dr Chris shows how one rainbow is formed with only two ingredients and three simple steps, giving Red Kangaroo and readers the perfect introduction to optical physics. In this new series, Chris Ferrie answers all the questions Red Kangaroo has about what things are made of and how things work using real-world and practical examples. Young readers will have a firm grasp of scientific and mathematical concepts to help answer many of their 'why' questions.