Tabletop RPGs are a great source of entertainment, but that doesn't mean they can't be informative as well. Some of the most interesting concepts for adventures could come from real life facts of science and history. Explorer type players will benefit especially from these inclusions, as they provide a new level of immersion and provide them with something interesting to discover in the game world.
|Wielicza Salt Mines|
|Nan Madol, Micronesia|
And of course, even browsing Wikipedia can provide some juicy tidbits of material. It doesn't have to be an academic-level source or citation, just a modicum of reality to spice things up. In fact, sometimes historical events that might not have happened could be a great addition to your game, like Archimedes' mirror-based Heat Ray. It's a neat idea, and your players may enjoy finding out more about that particular ancient anecdote.
Once again, there is no need to worry greatly about factual accuracy or turn your game table into a lecture hall. But there is so much to draw from in the world around us that it makes sense to use it to enhance our games. I highly encourage every game master to consider this and do their own research to incorporate these kinds of details into their future campaigns.