The Mishna at the end of the 4th perek of Pesachim tells us that the Chachamim approved of the "geniza" of Sefer Refuos by Chizkiyahu haMelech. Rashi explains that the Sefer Refuos was a book of remedies for sickness - in other words, a medical textbook - and the Chachamim were concerned lest people become overreliant on medicine and neglect tefillah and bitachon. (The Rambam has quite a different view - see Chazon Ish in Emunah U'Bitachon who has a careful analysis).
I am simply throwing out the question: when medicine, science, or "knowledge" of some type has the potential to lead people astray from halacha or belief, under what circumstances should there be censorship or "geniza"?
Is this the type enactment only Chazal could make, or is this in the hands of the chachamim of each dor to determine? What are the bounderies?
This concern was raised specifically in the times of Chizkiyahu haMelech, about whose generation the gemara in Sanhedrin tells us that even "tnok v'tinkoes" knew hilchos tumah v'tahara. Should we draw a kal v'chomer and be more concerned for our lesser dor, or could one argue that specifically because there was hightened religious awareness, the Sefer Refuos became "obsolete" (so to speak), but when science and secular knowledge is more prevelant, censorship is determental?