Word: bomb
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Dates: during 1960-1969
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While Kennedy seemed to be weighing all the arguments, his mind was made up: the U.S. would almost certainly have to test in the air. The clincher came from old Testing Foe Hans Bethe, whose detailed study showred that the Soviet blasts had been badly underrated. That 58-megaton bomb, Bethe reported, actually was a 100-megaton giant tamped down by a casing of lead. The U.S.S.R. could hang this on its biggest operational missile and hurl the full 100 megatons across 3,500 miles to the U.S. The Russians had made great gains in putting a bigger punch into...
...Atomic bomb dropped by U.S., on Hiroshima, Japan...
...Second atomic bomb dropped by U.S., on Nagasaki, Japan...
...World's first hydrogen bomb explosion, by U.S., in Operation Ivy near Eniwetok...
...First Soviet hydrogen bomb explosion...