Notebook

  1. Planetary Science

    To explain asteroid composition, scientists invoke nuts

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

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  2. Health & Medicine

    Survey catalogs what is stressing out Americans

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

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  3. Math

    Father-son mathematicians fold math into fonts

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

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  4. Earth

    Cloud seeding fueled fire about weather modification

    Experiments in 1964 resulted in “exploding” clouds.

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  5. Tech

    Robots start flat, then pop into shape and crawl

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