THE ATOM: A Matter of Energy

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The radioactive air mass from Siberia, floating westward over the Pacific Ocean one day last month, carried an international thunderclap. To the high-patrolling U.S. bombers, which scooped up samples of its fine dust, the radioactivity was obvious evidence of some kind of Russian atomic blast. To the scientists who analyzed the samplings, it was clear proof that the Russians had exploded a thermonuclear superbomb, a remarkably exact duplicate of the U.S.'s own. To the political leaders of the U.S., the air mass was one more ominous sign that the time...

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