Replica skeletons of Jobaria tiguidensis dinosaur

University of Chicago paleontologist Paul Sereno stands between replica skeletons of a full-grown, left, and juvenile Jobaria tiguidensis outside the National Geographic Society in Washington Nov. 11. The primitive, long-necked dinosaur that weighed an estimated 20 tons and grew to a length of 70 feet, was discovered in the Republic of Niger. (AP Photo/Kamenko Pajic)
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