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  1. Physics

    A nuclear clock prototype hints at ultraprecise timekeeping 

    Nuclear clocks could rival atomic clocks and allow for new tests of fundamental physics. A new experiment demonstrates all the ingredients needed.

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  2. Environment

    Fiddler crabs are migrating north to cooler waters

    The crabs are climate migrants and could be a harbinger of changes to come as more species move in.

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  3. Paleontology

    Despite new clues, this ancient fish has stumped scientists for centuries

    The 50-million-year-old Pegasus volans isn't closely related to seamoths or oarfish, like some researchers have suggested. But what is it?

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  4. Artificial Intelligence

    A new book tackles AI hype – and how to spot it

    In AI Snake Oil, two computer scientists set us straight on the power and limits of AI and offer advice for moving forward.