The absence of evidence is the only evidence of absence there can be. How do you know when to get milk? When there's no more. How do you know there's no more? You don't see any. If we were to argue that the lack of proof of milk meant that there could still be milk, we'd look like an imbecile and be completely unable to enjoy our morning breakfast cereal.You say magic does not exist.You are basing this affirmation on the fact that researchers said it didnt exist.However no one ever proved that magic couldnt exist,so there is still a possibilty of it existing.