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  1. Readers discuss the biology of sex, plastic in the brain and more

    By Science News Staff

  2. Math puzzle: The conundrum of sharing

    Solve the math puzzle from our June 2025 issue, in which friends must find ways to all enjoy hot mud beds.

    By Ben Orlin
  3. Health & Medicine

    Wet fingers always wrinkle in the same way

    Pruney fingertips aren't swollen sponges — the wrinkles actually come from blood vessels constricting and pulling skin inward.

    By McKenzie Prillaman
  4. Paleontology

    Sloths once came in a dizzying array of sizes. Here’s why

    A new fossil and DNA analysis traces how dozens of sloth species responded to climate shifts and humans.