So much beating around the bushes and so few answers being given by the FE'ers. For instance, I would like the cavendish experiment explained to me.
Matter in earth turns into magic matter the moment I turn it into a ball? As to your statement Jack of effects from outside, how do you explain that these "effects" affect the "cavendish matter" and not the "earthly matter"? Oh wait, I see, we have wizzards using their spells, and I thought Harry Potter was fiction, silly me...