TILE B
My name is Arthur Weasely, I'm a member of that large human minority the magic users of the Isles, (not the entertainment variety) and along with a few of us from the Ministry have been getting worried about interference from the electronics of the Others which lately have grown from being a mere nuisance to a downright menace.

Magic is simply another form of energy to which a few of us are sensitive and the Others are not although the truth is that many of them are but either don't recognise it as part of the electromagnetic spectrum or attribute it to a nervous or physiological condition.

When your lot started investigating high energy physics especially microwaves and radar, fascinating stuff by the way and the cavity magnetron, clever intuitive leap but it gave my department no end of problems.