George's secret key to the universe by Lucy and Stephen Hawking.

https://www.amazon.com/Georges-Secret-Universe-Stephen-Hawking/dp/1416985840

There are actually three books....weaves a fiction story with science.

Depending on age....magic school bus books do the same thing (picture and chapter books). I hated magic tree house but loved time warp trio...also great for those loving non fiction weaved into fiction.