A-hem...
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Proof Radium is a radio-active chemical element:
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-His name
-Being near him too long is dangerous for your health
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Proof that Radium is a Chaos Mage:
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-Funny clothing
-He's a mess
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Proof that Radium is an old granny in green make-up:
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-Green
-White-grayish hair
-Holding a walking stick
-Holding a colorful tissue in the other hand