After countless readings of the Greek Mythology book by Michael Townsend, we bought Where Do Presidents Come From?: And Other Presidential Stuff of Super Great Importance.
I can't say enough great things about his books. They are so funny, absurd, and dry. The 11 and 9-year-old understand all the humor and information completely and the almost 7-year-old just loves the the hamsters and bunnies. It's not just about presidents, it's about the whole presidential process—what presidents actually do, how they are elected, and the history behind all that. It's got so much information with dinosaurs thrown in. I am sure crossing my fingers he writes more of these.
Unrelated: I made super easy and fast dinner last night— shrimp with whole-wheat couscous and 3 out of 5 of us liked it a whole lot! (2 adults and one kid.)