George's Secret Key Paperback Collection:

George’s parents, who have always been wary of technology, warn him about their new neighbors, especially the girl George’s age, Annie, who seems to be following in her scientist father’s footsteps. But when George befriends them and Cosmos, their super-computer, he finds himself on wildly fun adventures through the galaxy that explore themes of physics, evolution, environmental conservation, and time travel.

This complete paperback collection includes:
George’s Secret Key to the Universe
George’s Cosmic Treasure Hunt
George and the Big Bang
George and the Unbreakable Code
George and the Blue Moon
George and the Ship of Time