ZURICH (Reuters) - An amateur paleontologist in Switzerland may have unearthed Europe's largest dinosaur mass grave after he dug up the remains of two Plateosaurus. The dinosaurs' bones came to light during house-building in the village of Frick, near the German border. "A hobby paleontologist looked at a construction site for a house and happened to discover the bones," said Monica Ruembeli from the Frick dinosaur museum. The finds show that an area known for Plateosaurus finds for decades may be much larger than originally thought. "It could be that the area extends for 1.5 kilometers (0.9 miles) and in...