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Science Magazine
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Cutting-edge research, news, commentary, and visuals from the Science family of journals. Follow @NewsfromScience for stories from our News team.
Washington, DC & Cambridge, UK
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    Science Magazine
    @ScienceMagazine
    Jul 30
    Research on the fossil record of mammals in Mexico suggests that the geographic region acted as a biodiversity “holding pen” for 10 million years, buffering the pace of both northward and southward movements of mammal species leading up to the Great American Biotic Interchange.
    A three-dimensional rendering shows the land bridge connection between North and South America. Research on the fossil record of mammals in Mexico suggests that the geographic region acted as a biodiversity “holding pen” for 10 million years, buffering the pace of both northward and southward movements of mammal species leading up to the Great American Biotic Interchange. Illustration: C. Bickel and V. Penney/Science. Data: NASA Blue Marble Imagery, August 2026; B. Tozer, D. T. Sandwell, W. H. F. Smith, C. Olson, J. R. Beale, P. Wessel, Global bathymetry and topography at 15 arc sec: SRTM15+ (2019), distributed by OpenTopography, https://doi.org/10.5069/G92R3PT9, accessed 24 June 2026
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    In 2020, a historic drought struck California’s Central Valley, where one-quarter of the food produced in the United States is grown, causing farmers to pump vast amounts of water from wells to keep their crops alive. All that pumping reduced the water pressure within the porous
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