It floats upright in Oregon's Crater Lake, but it's not a buoy or a pillar. It can be seen in different locations in different days, depending on the weather. In fact, it's not connected to anything to tether it to the lake's floor. Known as the "Old Man of the Lake," this mysterious phenomenon has perplexed park staff and visitors for decades.The Old Man is actually a hemlock tree stump that somehow remains upright in the water, even as it moves. Indeed, the Old Man goes along with the whims of the wind and waves. The 30-foot-long stump was first...