Cities worldwide dim lights to mark Earth Hour

Cities around the world were turning off their lights Saturday for Earth Hour, with this year's event highlighting the link between the destruction of nature and increasing outbreaks of diseases like Covid-19.

Silence in the sky—but why?

(Phys.org) —Scientists as eminent as Stephen Hawking and Carl Sagan have long believed that humans will one day colonise the universe. But how easy would it be, why would we want to, and why haven't we seen any evidence ...

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