The claim that serif typefaces are easier to read, particularly for long-form texts, seems to be considered established truth. I vaguely remember reading an article, however, that stated that there actually is no scientific study that conclusively supports that claim.
Do you happen to have a source for such evidence?
No, I don’t intend to be snarky at all. I truly haven’t seen any related study and would love to learn whether there is more to this claim than its consistent repetition. The rationale that the more unique shapes of serif glyphs make them easier to visually distinguish sounds perfectly reasonable and “believable;” but that’s not quite the same as actual scientific readability studies, of course.