One thing every expat loves to tell you about the UAE is how safe it is. It's almost a reflex. We say it to visiting friends. We say it to family back home who worry about the region. We say it because it has been true. This Saturday, I was reading in the hammock on our terrace when I heard two muffled booms. My family and I live between Abu Dhabi's international airport and the Formula 1 track, so loud noises are part of the rhythm of our days, and it took a message from a friend back home to