Learn more about the presidents of the United States on President's Day with these five educational and enjoyable apps.
America's Presidents [iPad, $4.99]
A guide to the Presidents that walks you through the Smithsonian's National Portrait Gallery. The app has a lot of wonderful art as well as some history.
Presidents vs. Aliens [iOS Universal, $0.99 and OS X, $1.99]
Presidents vs. Aliens is a fun game designed to increase your knowledge of presidential history. Answer questions and earn powers to defeat the incoming aliens. Each level unlocks another
