We love to root for the underdog, and when it comes to underdogs, few are more impressive than the world's great revolutionaries.After all, it's pretty hard to find a more powerful opponent than the world's biggest empires and emperors. And that's part of why we're drawn to the stories of revolutionaries. Many of these men and women were born into virtual dystopias, and they fought throughout their lives, against all odds, to forge a path to a better future. And whether they succeeded, failed, or succeeded only to become a new kind of enemy, there's something inherently fascinating about that effort to change the world.