Sixty years ago this weekend, the nuclear age began. At a top secret test site near Alamogordo, N.M., scientists successfully exploded an atomic weapon for the first time -- paving the way for a pair of nuclear bombs to be dropped on Japan a month later to end World War II. On Saturday, a small band of Zen monks and peace activists began a 1,600- mile walk from San Francisco to the Trinity Test Site in New Mexico to remind the world of the horrors of nuclear war and to help ensure the weapons are never used again. Some of...