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    • Sun Machines

      Sun Machines

      The Economist· 4 days ago

      A photovoltaic cell is a very simple thing: a square piece of silicon typically 182 millimetres on each side and about ...

    • Water, sand and humans: everything can be strange

      Fairbanks Daily News-Miner· 7 days ago

      David Hume, the 18th-century Enlightenment philosopher, and librarian at Edinburgh U., once observed “What a peculiar privilege has this little agitation of