Have you ever looked at something and wondered, "Where did that come from?" The 15 articles in Inventions will tell you the history of inventions, from simple things, like pencils, to complicated one, like the GPS on your cellphone. Some inventors were famous, but others were ordinary people with surprising stories. Improve your reading speed, comprehension, fluency, and vocabulary in a fun and easy way. The Big Ideas readers help you learn about the world while you learn English.