Carl Sagan with model of Viking Lander

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Sagan taught me the importance of polite, impartial, point-by-point scientific examination prior to utterly destroying a damn fool theory. He did this by example when he [discredited](http://www.holysmoke.org/cretins/velikov.htm) Velikovsky’s claim that Venus was ejected as a comet by Jupiter (among other similarly hair brained claims).

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