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What really prevents nations from making nuclear bombs

Nuclear bombs do not rely on size, they rely on physics. Here is how chain reactions and hydrogen bombs unleash power on a ...
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Pulitzer Prize finalist Garrett M. Graff discusses his new book about the atomic bomb

It's been just about 80 years since President Truman told the nation, August 6, 1945... (SOUNDBITE OF ARCHIVED RECORDING) HARRY S TRUMAN: A short time ago, an American airplane dropped one bomb on ...