Red Kangaroo ate too much junk food and now she has a stomachache! Can she go back in time to fix her mistake? Dr. Chris says, "Yes!" All Red Kangaroo needs to understand are the basics of general relativity. Once she masters them, she has the knowledge she needs to make herself feel better! In this new series, Chris Ferrie answers all the questions Red Kangaroo has for him 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 the "why" questions they may have.