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John J. Hopfield and Geoffrey E. Hinton received the Nobel Prize in Physics on Tuesday for discoveries that helped computers learn more in the way the human brain does, providing the building blocks for developments in artificial intelligence. The award is an acknowledgment of A.I.’s growing significance in the way …

J. Robert Oppenheimer teemed with contradictions. He was shy and bold, naïve and brilliant, a loyal husband who cheated, a gentle man whose bomb could kill millions. That he loved quantum physics may be no accident. The field holds that some basic phenomena of the material world have opposing features …

Thirteen states and the District of Columbia sued TikTok on Tuesday, accusing the company of creating an intentionally addictive app that harmed children and teenagers while making false claims to the public about its commitment to safety. In separate lawsuits, a bipartisan group of attorneys general cited internal company documents …