Researchers from the Urals Federal University, based in Yekaterinburg, have determined that the small stone-like pieces found near Lake Cherbarkul in the Chelyabinsk region are pieces of the meteorite that exploded over the region Feb. 15, 2013. A total of 53 pieces have been brought for analysis to the university in Yekaterinburg. (Alexander Khlopotov/Urals Federal University Press Service/AP Photo)