Unintended consequences. Israel closes the Gaza border because they are firing rockets into Israel. One year later there are an estimated 150 tunnels from Gaza to Egypt. Goods and weapons flow into Gaza, at a price. Hamas collects 'taxes' and thus has a vested interest in the tunnels. Successful tunnel operators grow wealthy, but depend on a closed border to drive their business. How to keep the border closed? Fire more rockets into Israel. --Spiegel Online reports here.