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Back in February, I visited one of the small museums that exist in the town where I live. It's a natural history museum and is based in an old church. It's a lovely place to visit, with lots of curious things to look at. In the shop, on the way out, there was a basket with small chunks of rocks and minerals for sale and I bought a small piece of 'fool's gold' (iron pyrites); I figured that an old fool like me deserved a piece of gold to treasure.     What I didn't know back the ...