The CRISPR machines that can wipe out entire species

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Charles Darwin had no idea what a gene was. If we dropped the father of evolution into 2019, the idea that humans can willfully alter the genes of an entire species would surely seem like wizardry to him.

But CRISPR gene drives -- a new, inconceivably powerful technique that forces genes to spread through a population -- have the ability to do just that. Gene drives allow us to hone the blunt edges of natural selection for our own purposes, potentially preventing the spread of disease or eradicating invasive pests.

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