entropy

Conversely, it's often said there is no Classical analog to Spin. Spin was so named because classically a spinning charged particle would possess a magnetic moment. Isn't this the analog?

Why would Spin have no classical analog, but Orbital Angular Momentum would? Is it because Spin has only 2 states?

Has anyone else run into this problem yet and/or know a fix?

A family member's brand-new house has the phrase, "Made with Post-Tensioned Concrete, Do NOT Drill!," stamped into the Garage floor in several places.

I saw a Discovery Channel show about Bridges built with the cables "Post-Tensioned," but how would this be done in a Garage Slab?

That is, can someone give me a summary of how, and why, a Garage slab would be build this way?

Have you ever tried this? Turn a faucet on and adjust the flow rate of the water until you have a very thin, but coherent column of water. Take a plastic pen and rub it vigorously against your hair, or pants, or anything that will give it a lot of static charge. Slowly bring it close to the water stream, perpendicular to the column of water.

The stream will deflect toward the pen and quite dramatically if the pen has a lot of charge.

Why?

My background is in Physics, and this is what I've been told. However, it doesn't seem to make sense to me. My position is the exact opposite, ie. - keep the spa close to the outside temperature and bring it up in temperature when using it. I'd like to hear what others think... with explanations, please.