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A-bombs and H-bombs explained

PARIS: 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. Here is a rundown on both types of weapon. The A-bomb These weapons have only been used twice in conflict, when the United States bombed Japan in the final…