Three years ago, I went with my oldest son on a scientific run up the Colorado to the base of the Hoover Dam. He was tracking Sucker Fish that he had implanted with radio transmitters. We were in a 20ft aluminum skiff, bristling with electronic equipment. Now, power boats are not allowed at the base of the dam, only kayaks and canoes. But my son Abe had permission to be there. It was a freezing November. Abe had hair down to his shoulders and a full, dark beard. I was shaven bald and covered with a heavy parka. We are both obviously of Arab decent. Got to the bottom of the dam and set out his radio receivers in the water. I glanced up, way up, to the top of the rock walls and spotted a guard with a very big gun looking at us through his scope! I whispered to my son that this guard had us in his scope. Abe said, "Just wave at him, dad. He is reading the numbers on my boat." He had a permit to be there. Yes, we looked like al-Qaida, I think. Thank <span style="text-decoration: line-through">Allah</span> God he waved back.....