I'm a geochemist. In the past ten years I've fixed mass spectrometers, blasted sapphires with a laser beam, explored for uranium in a nature reserve, and measured growth patterns in fish ears, and helped design the next generation of the world's most advanced ion probe. My main interest is in-situ mass spectrometry, but I have a soft spot in my heart for thermodynamics, drillers, and cosmochemistry.
Who would have thought that a few simple filaments of hydrated mantle could add so much complication to a home renovation? First person to correctly identify these minerals wins a rodent-sized isolation suit. I'll post more details once I get some sleep.