2 books · Ages 7–11 · Chapter Books
Inventions That Changed the World is a 2-book series for ages 7–11 by Chris Oxlade. Each book stands alone — start anywhere.
Start anywhere — each book stands alone.
That said, The Light Bulb and George Ferris' Grand Idea: The Ferris Wheel are great first picks.
No particular order needed — browse and pick what catches your eye.