I heard that the reason why we can't put our hands through a wall (or such a thing) is because of atomic electromagnetic forces pushing things away from each other (since after all, things are mostly empty space, and only seem solid because of the scale). I also heard that that is the same force that makes magnets work, except that it is amplified in ferromagnetic substances because those atoms have the ability to align their "spin", or something. So I have some questions, excuse me, they might be a bit newbish. 1. Why can only ferromagnetic materials align their spin like that? 2. When a ferromagnetic material is magnetized, what exactly is happening to the atoms, and how is it done?