We played around with various different gaseous atomic spectra. They are so interesting! Neon looks so red, and the sample marked "air" has so many different lines. We took some artful photos through our cameras, as shown above.
We didn't get quantitative with our observations; I wasn't sure if it was even going to work, but I think next year we can get quantitative. The lines are bright and easy to see, even through cheap diffraction gratings.
We are definitely finishing the year, and, just like last year, when we get to the end of the year, the questions about quantum mechanics are good. Quantum mechanics is weird. I try to explain, and I also try to postpone. I'm not a quantum mechanic!