On Aug. 5, 2008, ultra-runner Karl Meltzer set off on the biggest race of his life. His challenge: to run the entire length of the 2,174-mile Appalachian Trail in less than 47 days. Definitely daunting. Absolutely grueling. Probably insane. His website has many photos, and lots of short videos of the sloppy, watercourse trail conditions in Maine. Today, he’s up over Mt. Washington. This video was taken on day 4, Aug. 8, less than a week ago..