Notebook

  1. Planetary Science

    To explain asteroid composition, scientists invoke nuts

    Brazil nut effect may explain why only large boulders dot surfaces of asteroids.

    By Thomas Sumner
  2. Health & Medicine

    Survey catalogs what is stressing out Americans

    Along with work and other responsibilities, health problems are prominent causes of stress.

    By Science News Staff
  3. Math

    Father-son mathematicians fold math into fonts

    MIT’s Erik and Martin Demaine create puzzle typefaces to test new ideas.

    By Meghan Rosen
  4. Earth

    Cloud seeding fueled fire about weather modification

    Experiments in 1964 resulted in “exploding” clouds.

    By Science News Staff
  5. Tech

    Robots start flat, then pop into shape and crawl

    The machines use heated hinges to transform into shape and crawl around.