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Harsh: Europe's cannabis died just as the first farmers arrived

Harsh: Europe's cannabis died just as the first farmers arrived

17 May 2018

Cannabis – the source of the drug marijuana – virtually disappeared from Europe just as farmers arrived, so they didn’t get the chance to grow it for another 4500 years
The worst mass extinction may have begun with mass sterilisation

The worst mass extinction may have begun with mass sterilisation

7 February 2018

There seems to have been a surge in ultraviolet radiation during the Permian extinction 252 million years ago, and it might have left plants infertile rather than kill them

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