More than 125 people and two helicopters search in national park. Concern for a missing park ranger grew Monday as an intensified search failed for the third day to find any trace of Jeff Christensen. "We've got nothing," said Scott Sticha, information officer with the Rocky Mountain National Park. "If one of the dogs even turns their heads, we're on it. But we've got nothing." More than 125 searchers joined the effort Monday, more than double the number searching the day before, and two helicopters swept overhead. "The only thing that we have ruled out is lightning," Sticha said. "He...