Wired News has a feature on butane hash oil, a highly combustible form of marijuana that is increasingly produced inside the US. Just last week, FEMA posted an odd alert in its emergency services bulletin: “Hash Oil Explosions Increasing Across US,” along with the “more quotidian warnings of cyber terrorism and industrial vapor clouds.” Why: more explosions at apartments and hotel rooms involving “a process using butane to extract and concentrate compounds from marijuana.”