Gadolhadorah,
It is perfectly rational to believe many concepts in the Gemara were based on their knowledge at the time. Many Jews believe this. However, in the world of the ultras this is Kefira. I’ve heard this many times (with [poor] excuses for things that are obviously wrong) that everything Chazal said is 100% correct no matter how much it’ contradicts what we know today.
This is what happens when instead of appreciating our Chachomim for what they were we elevate them to Malachim/Niveim.
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