Flex your muscles, count to ten, or hold your breath under water. You wouldn't be able to do anything of these things without your brain, muscles, or lungs. Discover how these organs, and many more, function and work together to keep you alive. This 6-book collection combines stories from Fiction Readers and informational text found in TIME FOR KIDS(R) Nonfiction Readers to introduce students to multiple text types as called for in the Common Core and other state standards. Both the fiction and nonfiction books contain high-interest text, vibrant illustrations and images, age-appropriate text features, and increasingly complex vocabulary. The titles in this collection include: The Human Calculator; Your Guide to Superheroes; My Foot Fell Asleep; Look Inside: Your Brain; Look Inside: Your Skeleton and Muscles; and Look Inside: Your Heart and Lungs.