Extracting clean fuel from sunlight

Securing enough energy to meet human needs is one of the greatest challenges society has ever faced. Previously reliable sources—oil, gas and coal—are degrading air quality, devastating land and ocean and altering the ...

Building therapeutic cities to tackle mental health problems

In all likelihood, poor mental health has blighted every age of human existence. Evolutionary psychologists suggest it may be an intrinsic, even necessary, condition for our species. But there are grounds to suppose that ...

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