How do we stop cutting-edge technology falling into the wrong hands? | Hannah Fry

Technology offers gigantic upsides – diagnosing cancer, catching serial killers – but algorithms designed for one purpose can be easily used for a sinister one

As the Americans were flying over Hiroshima in the summer of 1945, Otto Hahn, the German scientist who first discovered that you could split a uranium atom in two, was being held captive in an English country estate by British forces.

As news of the bomb filtered through, the Brits surreptitiously recorded their prisoner’s reaction, catching on tape the moment that Hahn realised his work had been appropriated by the enemy and used in the most terrible show of force imaginable.

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