h2g2 The Hitchhiker's Guide to the Galaxy: Earth Edition

Did you know that the UK has two milky quartz stone circles in Cornwall and numerous other stones, with quartz crystals cemented onto them, up and down the country. I believe this is because they were originally meant to be made up of giant crystals as found at Almeria, Spain (big geode) and the Mexican mine that has crystals over forty feet long (Naica, Chihuahua)but our ancestors had to make do with what was around them and that didn't include anything like this

Actually I have just remembered that a researcher allegedly received a massive electric shock from a stone circle rock, which threw him some distance. If this was true, perhaps metal girders placed in the post holes for the stones, might create a rival to the electric grid?