Artificial intelligence is already making a difference in the theatre of war, and more involvement will certainly come. That raises a host of thorny ethical issues. In some cases, scientists just clocked, extinct beasts’ DNA can be extraordinarily well preserved—revealing once-inaccessible biological secrets (10:43). And remembering Pål Enger, who never quite knew why he felt compelled to steal “The Scream” (19:25).

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