A constant claim issued by non-rationalists, such as Rav Aharon Feldman and Rabbi Moshe Meiselman, is that it's absurd to state that Chazal or the Rishonim could have been mistaken about scientific facts, because their knowledge was far ahead of their era; Chazal knew things that have only recently been discovered by modern science. Over the last twenty years I've examined many such claims, and in every single case, I discovered that the alleged modern scientific facts stated by Chazal are either