I just watched an article on the news about a "sand battery" in Finland. It's just a huge silo full of sand which can be heated to 500oC during the summer then used to heat the town during the winter.
As the camera panned over the town I spotted this:-

I can't find a Finnish to English translation, so, I assume it means what it says in English: but why?
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We are alone in the universe, or, we are not. Either way it's incredible... Adapted from R. Buckminster Fuller/Arthur C. Clarke
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