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In larger atoms, like Gold, electrons move close enough to the speed of light to induce relativistic affects; relativistic quantum chemistry. These show up as anomalies in the Schrödinger equations used to model the wave functions of atomic orbitals. These anomalies can be explain with accuracy using relativity. The yellow color of the metal Gold is connected to a time shift in the reflected light; all the reflected light gains a yellow cast. This is not due to excited electrons since even red reflected light will get a yellow cast, with yellow higher energy than red.

I was asked today at a Q and A session by a member of the public to please explain what physicists mean when they talk about quantum spin. I'd be really interested in how everyone here would have approached this please?

A game that helps explain spin?...sorry, you cannot view external links. To see them, please REGISTER or LOGINThe game seems to be made of 2 hand-size blocks of wood, and 3 strings.But from the description, I can't understand how it works.Maybe a good toy for a science fair?

I was asked today at a Q and A session by a member of the public to please explain what physicists mean when they talk about quantum spin.I'd be really interested in how everyone here would have approached this please?

The most convenient quantum mechanical description of particle's spin is therefore with a set of complex numbers corresponding to amplitudes of finding a given value of projection of its intrinsic angular momentum on a given axis.