There’s a great post at Kidlit about how to write a non-fiction query.

You’ve probably heard my thoughts on this before. Recently, I’ve found that my children’s non-fiction queries also need a unique concept or treatment to go along with the subject matter. For example, a book about how human nerves work… too boring. But a book about the nervous system featuring graphic-novel style illustrations and the Marquis de Sade as a narrator… that will sell.

Obviously, that’s not a practical example for children’s non-fiction, but you get the idea. Concept is key!