…talking a little bit about historically. You see, it was a shock the moment it was discovered. There was an experiment done by Stern and Gerlach, and if you wish, you can say that the experiment I'm about to describe is my justification for this. Of…

…here, then there's a force one way in an inhomogeneous field. Here is an inhomogeneous field similar to the one of Stern and Gerlach. It's actually made a little differently. In the meantime, they found easier ways with wires to make inhomogeneous fields,…