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https://www.wsj.com/tech/ai/at-artificial-intelligence-summit-a-u-k-official-warns-take-science-fiction-seriously-b3f31608 BLETCHLEY, United Kingdom—Here in the English countryside, at an estate where World War II codebreakers cracked the Nazis’ Enigma encryption machine, world leaders pledged to work together to lessen risks of a technology they said also poses a grave threat., they said, could in its most advanced forms create catastrophic risks in realms including cybersecurity and biotechnology—or even escape human control.This copy is for your personal, non-commercial use only.