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Field Museum scientist James Holstein rests his hand on a... News PhotoChicago - Illinois,Field Museum,Geographical Locations,Hand,Horizontal,Illinois,Museum,Research,Resting,Scientist,USAPhotographer Collection: Tribune News Service 2013 MCTField Museum scientist James Holstein rests his hand on a 244-million-year-old fossil in a research area of the museum, January 7, 2013, in Chicago, Illinois. He discovered the fossil, the Thalattoarchon Saurophagis, during an exploration of a remote mountain range in Central Nevada. The creature was a marine reptile that roamed the sea as a predator that lived at the same time as dinosaurs. (Alex Garcia/Chicago Tribune/MCT via Getty Images)