This year's Nobel Prize in chemistry honours a revolution

With Crispr, two scientists turned a bacterial defence against viruses into an invention that will transform the human race

When American Jennifer Doudna was in sixth grade, she came home one day to find that her dad had left a paperback titled The Double Helix on her bed.

She put it aside, thinking it was one of those detective tales she loved. When she read it on a rainy Saturday, she discovered she was right, in a way.

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