As most of you know, Vice President Joe Biden made news this week when he offered this praise to the mission to raid Osama bin Laden's Abbotabad hideout: "You can go back 500 years. You cannot find a more audacious plan." Now, not to diminish the mission to take out bin Laden, but this is clearly going a wee bit overboard. And what's interesting to me is his choice of "500 years." This seems awfully specific, so I checked to see what happened in 1511 that might have been the more audacious event. Here, to my mind, are the contenders.