The cave is cool and damp -- prefect for preserving prehistoric remains, Meachen says. "It's like a refrigerator in there, and probably has been for 20,000 years," she said. "Some of the bones we're finding there have collagen in them. That is where you could get the ancient DNA." The scientists saw bones falling out of a part of the cave, and decided to start digging there. "That was the fossil layer," she said. "There is so much to dig. We have two more years for funding that we can be out there, so we are going to try to...