2 books · Ages 6–9 · Chapter Books
How To Experiments is a 2-book series for ages 6–9 by Lori Shores. Each book stands alone — start anywhere.
Start anywhere — each book stands alone.
That said, How to Build a Fizzy Rocket and How to Build a Tornado in a Bottle are great first picks.
No particular order needed — browse and pick what catches your eye.