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  1. Animals

    Where’d I Put That?

    Birds that hide and recover thousands of separate caches of seeds have become a model for investigating how animals' minds work.

    By Susan Milius
  2. Math

    Turning a Snowball Inside Out

    Turning a sphere inside out without allowing any sharp creases along the way is a tricky mathematical maneuver. Carving an intricate snow sculpture depicting a crucial step in this twisty transformation presents its own difficulties. This was the challenge facing a team led by mathematician Stan Wagon of Macalester College in St. Paul, Minn., last […]

    By Ivars Peterson

  3. From the February 3, 1934, issue

    alt=”Click to view larger image”> SHORT-WAVE PHONE SYSTEM SERVES BRIDGE BUILDERS Curiously, radio is helping to build a bridge.