Alternative histories
In addition to the pleasure of reading a rousing story, there is a special benefit in exploring alternative histories. You know, the ones that ask what if? What if the Nazis won? What if the Russians landed on the moon first? This question is both a great way to approach history, and a good skill for thinking about the future. The Sideways Awards for Alternative History on Wikipedia is a fantastic source that lists the best alternative history stories written for each of the past 30 years. — KK