100000 Whys: Big Questions and Amazing Answers for Curious Kids Ages 6–10

100,000 Whys for Curious Kids Asking About Quantum Physics: Fun and Amazing Answers About Atoms, Light, Energy & the Tiny World (Ages 6-12) (Amazing Kids)

Answers To Big Questions Every 10 Year Old Should Know: Mind-Bending Facts And General Knowledge Bombs For Curious 10 Year Old Boys and Girls

Understanding 10-11-Year-Olds

Would You Rather Book of Imaginative Questions For Kids and Teens:: 350 and Challenging Questions to Make You Laugh, and hilarious thinking deeply (Ages 7-14)