There's nothing subtle about sunflowers. There they stand, taller than the garden fence, with vibrant yellow heads screaming summer and 'look at me'. But as summer turns to autumn, their heavy heads ...
A new sunflower-inspired pattern increases concentrated solar efficiency. Just outside Seville, in the desert region of Andalucia, Spain, sits an oasis-like sight: a 100-meter-high pillar surrounded ...
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