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2015-02-08T19:16:35+08:00

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The problem tricky but I'll try. 

-The first guy to put some attention on radiation - it would be Wilhelm Konrad Roentgen (the man who discover x-ray and first put it into application) - 1895
 -The first guy who observed radiation in nature was Antoine-Henri Becquerel (the radioactivity of uranium) - 1896
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