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[–] Thyhorrorcosmic103 0 points 3 points (+3|-0) ago 

There is a book by michio kaku that discusses the different levels of advancement and intelligence required to attain certain distances in space travel. I found it rather interesting.

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[–] 19694906? 1 point 0 points (+1|-1) ago 

His show on A.M. Radio is pretty good. Thanks for the info.