In 1954, the United States detonated Castle Bravo at Bikini Atoll expecting a far smaller blast, but the explosion came out vastly stronger than planned and became the largest nuclear test in U.S.

MAJURO, MARSHALL ISLANDS - Lemeyo Abon learned about snow from the movies played on projectors by visiting American sailors. But living on Rongelap - a remote tropical atoll in the central Pacific ...