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  1. Tech

    Unlocking the Gaits: Robot tests locomotion switch

    A blocky, bright-yellow robot that would look at home in a toy chest moves like a salamander, just as its inventors intended.

    By Aimee Cunningham
  2. Math

    Functional Family: Mock theta mystery solved

    Mathematicians have solved a legendary Indian mathematician's final problem.

    By Erica Klarreich
  3. Earth

    High and Dry: Pollution may stifle mountain precipitation

    Trends seen in meteorological data gathered on a Chinese mountaintop suggest that air pollution reduces the amount of precipitation that falls in high-altitude regions.

    By Sid Perkins
  4. Math

    Cutting a Pie Is No Piece of Cake

    Mathematicians find that slicing a pie into fair pieces is harder than divvying up a sheet cake.