1493 is all over the place...and that's a good thing.
Charles C. Mann's follow up to his spectacular
1491 look at the pre-Columbian Americas is quite an admirable undertaking. Here he looks at the consequences of Columbus's voyages to the Americas. For better and/or for worse they had far reaching affects, especially biologically. Mann's premise seems to state that Columbus was not a morally good man, but he should be celebrated as bringing about the world's biological homogenization. Though this is no murder mystery, I'm going to refrain from giving examples, because that would spoil the fun of reading
1493.
...hm...well, that doesn't give me much else to talk about.