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  1. Climate

    A stunning visualization of Alaska’s Yukon Delta shows a land in transition

    Water and ice helped form the Yukon River’s delta. Now, climate change is reshaping it.

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  2. Life

    ‘Wild Souls’ explores what we owe animals in a human-dominated world

    The new book Wild Souls explores the ethical dilemmas of saving Earth’s endangered animals.

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  3. Paleontology

    3.42-billion-year-old fossil threads may be the oldest known archaea microbes

    The structure and chemistry of these ancient cell-like fossils may hint where Earth’s early inhabitants evolved and how they got their energy.

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  4. Readers weigh in on the Brazil nut effect, clock entropy and more

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  5. A century of exploring the endless final frontier

    Editor in chief Nancy Shute discusses a century of astronomy and scientists' search for worlds beyond our own

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  6. Physics

    With Steven Weinberg’s death, physics loses a titan

    The Nobel laureate advanced the theory of particles and forces, and wrote insightfully for a wider public.