Maria Popova unearths a set of nine rules for healthy skepticism, set down by the man she calls "our era's greatest patron saint of reason and common sense." Popova writes that Sagan's politely named "baloney detection kit" comes from science but "contains invaluable tools of healthy skepticism that apply just as elegantly, and just as necessarily, to everyday life. By adopting the kit, we can all shield ourselves against clueless guile and deliberate manipulation."
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