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- Mössbauer effect
I've been thinking back to my undergraduate courses in physics. One course, Advanced Lab, required sending a small Fe sample to the core of a small nuclear reactor just off campus, then run it back to the lab before it decayed to much to observe the Mössbauer effect. That reactor had to be dismantled a few years later due to public controversy.
Now I'm going to search through some boxes to see if I still have the write up to that experiment. Those were the good old times. 

