National Geographic Kids Brain Games: The Mind-Blowing Science of Your Amazing Brain

Mastermind: Over 100 Games, Tests, and Puzzles to Unleash Your Inner Genius (National Geographic Kids)

Brain Games: Big Book of Boredom Busters

National Geographic Kids Why?: Over 1,111 Answers to Everything

5,000 Awesome Facts (About Everything!) (National Geographic Kids)

Difficult Riddles For Smart Kids: 300 Difficult Riddles And Brain Teasers Families Will Love (Books for Smart Kids)

Science Encyclopedia: Atom Smashing, Food Chemistry, Animals, Space, and More!

Brain Games for Clever Kids: Puzzles to Exercise Your Mind

National Geographic Kids Quiz Whiz: 1,000 Super Fun, Mind-bending, Totally Awesome Trivia Questions

Mistakes That Worked: 40 Familiar Inventions & How They Came to Be

5,000 Awesome Facts (About Everything!) 3 (National Geographic Kids)

Mastermind: Over 100 Games, Tests, and Puzzles to Unleash Your Inner Genius (National Geographic Kids)

Brain Games: Big Book of Boredom Busters

National Geographic Kids Why?: Over 1,111 Answers to Everything

5,000 Awesome Facts (About Everything!) (National Geographic Kids)

Difficult Riddles For Smart Kids: 300 Difficult Riddles And Brain Teasers Families Will Love (Books for Smart Kids)

Science Encyclopedia: Atom Smashing, Food Chemistry, Animals, Space, and More!

Brain Games for Clever Kids: Puzzles to Exercise Your Mind

National Geographic Kids Quiz Whiz: 1,000 Super Fun, Mind-bending, Totally Awesome Trivia Questions

Mistakes That Worked: 40 Familiar Inventions & How They Came to Be

5,000 Awesome Facts (About Everything!) 3 (National Geographic Kids)