Why Yemen's Houthi rebels have only grown stronger through years of war
At various times over the last decade, Saudi Arabia, the United Arab Emirates, the United States, Britain and Israel have carried out punishing air raids on Yemen's Houthi rebels -- only to see them grow even stronger. Now, as the Iran-backed Houthis advance on a key maritime chokepoint and strike Saudi oil facilities, rattling world markets, there is little that can be done to stop them that hasn't been tried before. That's because the Houthis operate in a large and mountainous territory where…



