Scientists examined leaves dating from the Irish potato famine to unlock the genome of the blight behind the disaster.

Republic of Ireland
A potato leaf specimen from the Kew Garden herbarium, collected in 1847, during the height of the Irish famine, provided a crucial DNA sample that helped unlock the genome of the blight that caused widespread starvation and wholesale migration in 19th Century Ireland. Marco Thines/Senckenberg Gesellschaft für Naturforschung
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