I do notice that there were many people saying that they have magical powers/abilities and so on. Should i suggest that its a placebo effect from you yourself? Perhaps you should look up on in formations of those 'witch doctor' and read up on the reasons behind the mystical effect. That is myth...
People say that marbles experience friction when rolling across a surface,but i don't get why. The dynamic and static friction don't seem to fit here and the point is that it have a very little contact with the surface. Note that its not rubbing across the surface but rather rolling across it...