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Helium-3: Mining the fuel of the future on the Moon
(english.elpais.com)
This is a most excellent place for technology news and articles.
I think it was 20 years ago in a sci-fi themed magazine for kids ("Miracles and mysteries of the planet Earth" or "Young erudite" maybe) where I first have read something about this thing being mined in no further than 20 years from then.