When I was a kid, like 9 or 10, I picked up my dad's copy of Gödel, Escher, Bach and noted, delightedly, that there were fun little stories at the beginning of each chapter starring Achilles and a Tortoise (ignoring the dense text). I read every one multiple times, and it gave me exposure to the ideas far, far earlier that I otherwise would have.

Don't ever criticize a book for having really simple parts.