CAÑON CITY - "Evan, Evan," the searchers yelled down into the canyon, hoping the Lakewood boy would answer, but the wind carried away their calls. Moving to another vantage point at the top of the cliff, they peered into the crevices and megaphoned, "Evan . . . Evan." The wind simply swirled Evan Thompson's name away again, and the canyon fell silent. A third day of searching the rugged mountains of southern Colorado ended Monday with a previously located trail of shoeprints the only clue to the child's disappearance. "People can just vanish in this country," said Jack Bales, a...