My son is 5 and has proven to be a total scientist. His current favorite book: H A Rey's The Stars, A New Way to See Them. We take that, a red flashlight, and binoculars out back before bed. He insists on learning the stories. The "kit" of the book, binos and red light sit on the coffee table by the back door, ever ready.

http://www.amazon.com/Stars-New-Way-See-Them/dp/0395248302/r...

Here's a new topic, please tell us about great books you recommend for boys: http://news.ycombinator.com/item?id=1724596