I’m a couple days late to this—but, in celebration of National Grammar Day, one of my favorite language blogs, Motivated Grammar, posted Ten Grammar Myths, Debunked. The most interesting (i.e., new to me):
Disinterested and uninterested are separating, not blurring. Though many people believe that these two words ought to mean different things, they haven’t historically. In fact, the overlap in meaning between the two isn’t indicative of a distinction being lost, but rather a distinction appearing.