A-bombs and H-bombs explained

The world's nuclear arsenals are comprised mainly of two types of warheads -- atomic bombs, also called A-bombs, and the more powerful hydrogen or H-bombs. North Korea, escalating its war of rhetoric with the United States, on Friday hinted it may explode an H-bomb over the Pacific, having already carried out underground tests of atomic and hydrogen bombs. This weapons have only been used twice in conflict, when the United States bombed Japan in the final days of World War II, although they have been tested several hundred times.
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