The best one is /r/askhistorians. They delete like 95% of all comments made for being low quality or useless, but the upside is that any comment remaining is wo

The best one is /r/askhistorians. They delete like 95% of all comments made for being low quality or useless, but the upside is that any comment remaining is worth reading. Some people find that subreddit draconian in how it is modded, but it works in keeping the quality of the subreddit up.