A far-left activist group in Germany has claimed responsibility for a suspected arson attack that left tens of thousands of homes, as well as hospitals and businesses, without power in around-freezing ...

Understand and code the R² metric (goodness of fit) in C++. A must-know concept for evaluating regression models. China issues new Greenland warning to Trump administration The healthiest breakfast ...

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Yaroslav Trofimov is the chief foreign-affairs correspondent of The Wall Street Journal, covering major issues and developments around the world. He won the National Press Club award for political ...