I recently ran across an awesome book idea on KickStarter! It's a project to write a book for pre-schoolers on the topic of evolution. It's called "Grandmother Fish: A Child's First Book of Evolution". I have a pre-schooler myself so the project hits home and received $25 from me. A $25 donation gets you a copy of the book when it is published in March 2015 (estimated).
You have until July 22, 2014 to help fund this project. I definitely recommend you check it out.