It was a typical September day for Ed Blanchard. He was riding his bike in the afternoon heat along a canal. While waiting to cross an intersection, he saw his wife of 35 years driving past. They waved. “I have a real bright vision of that … it’s the last thing I remember,” said Blanchard, a 66-year-old retired engineer. “I didn’t know where I was or why I was there when I woke up.” The Gilbert, Ariz., resident had cause to be bewildered. He ...