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  1. Cosmology

    In an epic cosmology clash, rival scientists begin to find common ground 

    Different measurements of the cosmic expansion rate disagree. The James Webb telescope could determine whether that disagreement is real.

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  2. 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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  3. 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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  4. 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.