We now live in a world where it's way more likely that kids become familiar with computers than to meet cow in real life! Still, if browse children's books, you'll find maaaany farms and very few computers.
These are Zerus & Ona, and they live in the heart of computers together with terabytes of other zeros and ones. It's The Binary World!
Their first book "Zerus gets a Virus" is already out and more are coming.