The theory that being homosexual may be genetic. If proved as real, then it would be a game changer for a lot of homophobic people, as they believe being homosexual is a choice that will inevitably lead them to their doom. It has the potential to change a lot of mindsets and at least have more people tolerate them than loudly voice against them. Especially in scientific knowledge, where you can't refute because it is known for being factual and backed with scientific, concrete evidence. Data, of course, can be manipulated depending on the stance of the scientist, but it is generally less conceptualized and subjective compared to literature, which is heavily dependent on interpretations and subtleties.