4 books · Ages 4–11 · Chapter Books
The Invention Hunters is a 4-book series for ages 4–11 by Korwin Briggs. Each book stands alone — start anywhere.
Start anywhere — each book stands alone.
That said, Invention Hunters Discover How Sound Works and Invention Hunters Discover How Light Works are great first picks.
No particular order needed — browse and pick what catches your eye.