A period of sudden global warming 55 million years ago radically changed life on Earth. Animals and even plants went on the move in search of cooler places. A Smithsonian paleontologist named Scott Wing has found a way of telling the temperatures of this time.
Paleontologists have had a good year, bringing a slew of new dinosaurs to the books. We pored through the many finds to bring you the best horned, bird-footed, feathered and, of course, ferocious new dinosaurs unveiled for the year 2009.