2,000 volunteers join a painstaking effort to restore massive skeleton of prehistoric predator
Volunteers clean the skeleton of a Mastodonsaurus, a huge amphibian that walked the Earth 240 million years ago, at the Copernicus Science Center in Warsaw, Poland. | Photo Credit: AP Volunteers armed with chisels, brushes and protective goggles chip away at rock encasing the bones of a massive prehistoric amphibian in a glass-walled laboratory on…