If you’ve ever wondered what my nightmares are like, they pretty much go like this. On Sept. 27, a group of hikers was enjoying the fall weather on the Japanese volcano Mount Ontake. Suddenly, the volcano erupted, letting loose an incredible pyroclastic flow, a torrent of superheated ash that barrels down the slopes of the volcano like a thundering wall of death. The hikers tried to get away, but the […]