The series I recommend is Ballpark Mysteries. They are fiction books, but you still learn a lot of stuff. My favorite book out of the series is The San Francisco Splash. It is a very exciting book and I couldn’t get my head out of it! It is by David Kelly.
The second series I recommend is The Battle Bugs. Someone travels to a place called Bug Island and the lizards try to take over the island. The book I recommend in Battle Bugs is the Komodo Conflict by Jack Patton.