"With the collision of the Shoemaker comet into Jupiter, the era of uniformitarian orthodoxy must come to an end. Minds that have been closed for nearly half a millennium can now be opened to see what really has happened to our planet in the past -- and that past is not as distant as we might suppose."

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The history of interactions among disparate peoples is what shaped the modern world through conquest, epidemics and genocide. Those collisions created reverberations that have still not died down after many centuries, and that are actively continuing in some of the world's most troubled areas.

— Jared Diamond