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Why Einstein Thought Nuclear Weapons Impossible?

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In Today’s world, we have   Nuclear Weapons  and Nuclear Power Plants you might think that it was always inevitable that we would be able to harness the energy inside the nucleus of atoms. But, that was far from the case, in fact, serious scientists thought the idea was laughable like Nobel Laureate Robert Millikan who in 1928 said “there is no likelihood man can ever tap the power of the atom” .   The glib supposition of utilizing atomic energy when our coal has run out is a completely unscientific Utopian dream or as Rutherford, put it anyone who expects a source of power from the transformation of these atoms is talking moonshine and now there was good reason for their pessimism when Becquerel first observed to radioactivity, he thought it was a phenomenon similar to phosphorescence.  That's when you shine radiation like light onto an object and it absorbs that energy and later re-radiates it in a different part of the spectrum and now uranium ore was known to ...