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nezgodan2 kaže:
kak to da nafta nije radioaktivna?
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Pretpostavljam da je zato sto su radioaktivne jezgre u pravilu prilicno masivne, i time nesklone plutanju. Nafta je uglavnom ugljik i vodik. 
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Our imagination is stretched to the utmost, not, as in fiction, to imagine things which are not really there, but just to comprehend those things which are there.
--Richard P. Feynman
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