Glover, David

Discover It Yourself: Batteries, Bulbs, and Wires

Discover It Yourself: Flying and Floating

Discover It Yourself: Solids and Liquids

Discover It Yourself: Sound and Light

The Cavern of Clues

The Mansion of Mazes (Maths Quest)

The Museum of Mysteries (Maths Quest)

The Planet of Puzzles