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The attack on Ukraine's rail network, which connects the country to the West, was a jab at Europe, officials said.

The kingdom is in a state of strategic shock after coming under attack from an emboldened Iran and failing to win more U.S. military support, analysts say.

We look into the concerns over artificial intelligence.

Jacob Coxon, who quit his job at Anthropic, discusses his concerns about the risks of artificial intelligence.

Plus, the man who went to space -- and never wanted to go back.

Companies at the forefront of artificial intelligence in Asia, Europe and the United States posted declines after tech leaders expressed worries about the safety of "frontier" A.I. technology.

Cutting-edge technologies have reshaped the Russian capital, making it safer, more convenient -- and more closely watched.

Current chatbots aren't likely to help lone actors invent a deadly pathogen, experts say. But newer models, trained in biology, may need stronger safeguards.

Persistent distractions are feeding a climate of mistrust as the U.S. military faces a series of wartime issues, including shortfalls of missile interceptors.

Starting Sept. 21, we'll unveil a list of 100, as voted on by more than 500 television professionals in Hollywood and around the world. Make sure you're getting updates.