True, but occasionally in an old story, you will come upon the hulk of an old scientific controversy, or something the "New Scientist" of the age tried to puff up into one, or a mistake (widely reported at the time, but now forgotten), entombed far past its "sell by" date.

I'm too distracted at the moment to come up with an example, except of courseJourney to the Center of the Earth, and maybe Velikovsky.