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Par yvig dans 6 Minute English le 28 Juin 2022 à 11:52...drop of wa ter, it would just break a part , split in two… and this ac tion of splitting the u ra nium has be co me known as fi ssion. Rob: A toms of u ra nium are ve ry fra gile - ea sily bro ken or da maged. In 1938, it was di s co vered that when nu clear par ticles called neu trons were fired...