In another career, I did a lot of interesting microscopy on chalcogenides. They had some really interesting order-disorder transitions, which might have helped explain why they were good Thermoelectric and phase change materials. I changed careers before I got to the bottom of it.
What's your personal great white whale of an unsolved mystery? The thing you desperately hope is solved before you die because you need to know the answer? Mine is the Isabella Stewart Gardener Museum heist. Where the hell are the Rembrandts. I need the full story