In a terse statement the U.S. Atomic Energy Commission last week announced that the Soviet Union had fired another nuclear explosion. Said AEC Chairman Lewis Strauss: "This explosion was the largest thus far in the U.S.S.R.. and was in the range of megatons. The Russian tests indicate an increasingly intensive effort by the Soviet government to develop their nuclear weapons potential."

Three days later, the Soviet foreign ministry confirmed the AEC announcement and revealed a little more. The bomb, said the foreign ministry, was exploded at great height to minimize the radioactive...

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