Hundreds of years ago, the Inka Empire was the largest on Earth. The Inka were great builders, and created roads that helped the empire run smoothly. The most impressive part of the Inka roads were the bridges that were made out of a simple resource: they were made from grass! Learn about these engineering marvels with this e-book that builds students' literacy skills while fostering curiosity, creativity, and innovation. A hands-on STEAM challenge will guide students through the engineering design process: researching the issue, designing and testing a solution, evaluating the results, and improving the process. Through real-world examples, students will gain insight into how the engineering design process is used to solve real-world problems. This book includes content that highlights every aspect of STEAM: science, technology, engineering, the arts, and math. It also features STEAM career advice from Smithsonian employees working in STEAM fields. By becoming STEAM proficient, students are prepared to answer complex questions, investigate global issues, develop solutions for modern-day problems, and are ready for college and career.