This Arabian desert was once a lush paradise. Why did ancient humans avoid it?

Expedition revealed that water wasn’t enough for human settlement — plus, proposals to block sunlight get serious.

00:49 A failed desert expedition to find human tools reveals what humans needed to thriveResearch Article: Dellmour et al.

12:33 Research HighlightsNature: Sleep declines in rural communities after electricity arrives

Nature: AI doctors’ orders come with a sky-high bill

15:14 Could satellites help cool the Earth?Nature: Could a giant sunshade in space 'solve global warming'? Scientists are taking the idea seriously

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