Cambridge Discovery Education Interactive Readers are the next generation of graded readers - captivating topics, high-impact video, and interactive exercises designed to motivate and engage. How fast is fast? Humans, cars, animals: they all have the ability to go fast. Come explore the many ways we can speed. Use the unique code inside the book to access the online reader, complete with videos and interactive exercises. Word count: 1797. Lexile reading level: 700L