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Ayatollah Mojtaba Khamenei’s absence has raised questions inside Iranian political circles about who is really running the country and allowed open divisions to fester. By Farnaz Fassihi Ukraine is ...

Cracks are appearing in the artificial-intelligence trade, whiplashing tech-heavy indexes as doubts about the profitability and sustainability of the AI build-out creep in. Water used at the power ...

President Donald Trump's effort to boost production of bio-based diesel and deliver on promises to farmers and rural communities is colliding with a market reality: U.S. plants are not keeping up with ...