Black Holes and Uncle Albert

The Time and Space of Uncle Albert

Uncle Albert and Quantum Quest

George and the Big Bang (George's Secret Key)

George's Cosmic Treasure Hunt (George's Secret Key)

George's Secret Key to the Universe

Estes 1292 Wizard Flying Model Rocket Kit

Albert Einstein and Relativity for Kids: His Life and Ideas with 21 Activities and Thought Experiments (For Kids series)

George and the Unbreakable Code

George's Secret Key Paperback Collection: George's Secret Key to the Universe; George's Cosmic Treasure Hunt; George and the Big Bang

Stephen Hawking: Cosmologist Who Gets a Big Bang Out of the Universe (Getting to Know the World's Greatest Inventors & Scientists (Paperback))