Nearly four weeks into Operation Protective Edge, Ahmed Borai is explaining how to separate hydrogen from seawater. Gaza’s sole power plant was bombed out of commission four days earlier, leaving Gaza City blacked out and reducing the rest of the strip to two hours of electricity a day. The gasoline needed to run a generator costs two dollars a liter, the plant could take a year to repair, and Ahmed doesn’t have that kind of time or money to spare. So he’s using a car battery and a converter to run high voltage through a barrel of water to create an alternative — albeit highly explosive — source of fuel…