Article: Louis Rosen, at 91; physicist worked on first nuclear bombs

NEW YORK - On May 9, 1951, on a coral atoll in the Pacific, scientists ignited what they hoped would be the first man-made thermonuclear reaction, the basis of the hydrogen bomb. A fireball rose 1,800 feet.

But the explosion alone, awe-inspiring though it was, was not enough to convince one eyewitness, Edward Teller, considered the father of the H-bomb, that thermonuclear fusion had indeed occurred. For that he had to wait for the results of a test devised by two young fellow physicists who worked with him at Los Alamos, N.M., where the first atomic bombs had been built.

At 5:30 the next morning, one of those colleagues, Louis Rosen, told Teller the exhilarating news: Yes, fusion had been ...

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