Scientists have found a way to make sure their mutant genetic creations don’t spread in the wild

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In Ray Bradbury’s classic short story “A Sound of Thunder,” there is a lesson no doubt heavy on the minds of today’s gene-hacking scientists: a man travels back in time to hunt dinosaurs, only to find that by mistakenly stepping on a butterfly he subtly alters the entire future. With our newly acquired ability to permanently alter the genetics of entire species, it’s hard not to wonder whether Bradbury’s writings were fiction or foreshadowing...

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