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  1. Readers discuss swimming sperm, a fishing fox and more

    By Science News Staff
  2. Physics

    Here’s how to make a fiber-optic cable out of air using a laser

    A hollowed-out laser beam heats a tube of air that surrounds cooler air, providing a way to guide light much the way fiber optics do.

    By James R. Riordon

  3. Seeking the elements that make modern life possible

    Editor in chief Nancy Shute discusses the importance of rare earth elements to society.

    By Nancy Shute
  4. Archaeology

    Lasers reveal sites used as the Americas’ oldest known star calendars

    By around 3,100 years ago, Mesoamerican ritual complexes tracked celestial cycles using a 260-day count, a huge lidar mapping project shows.