…is, if we let the particles out, in a certain state phi from something. And then they had a piece of apparatus. It's Dan Gerlach experiments and what have you. Then they could come out the other. So we'd ask anyway with a measurement to see if they're…

…test later on to see if it's in 0 of r. And in between, I have everything. I have a kitchen sink. I have Stan Gerlach apparatus with slots and things. I have a P apparatus that gets a zero, zero minus oriented in one direction. Then I have another…

…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 course, historically,…

…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, but it's…