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  1. Spreading Consciousness

    A reanalysis of brain-imaging data links conscious visual experience to activity patterns throughout the brain, challenging the popular view that specific brain areas coordinate this mental state.

    By Bruce Bower
  2. Math

    Completing Latin Squares

    Using only the numbers 1, 2, 3, and 4, arrange four sets of these numbers into a four-by-four array so that no column or row contains the same two numbers. The result is known as a Latin square. Here are two examples of Latin squares of order 4: 1 2 3 4 2 1 4 […]

    By Ivars Peterson
  3. Earth

    Shifting Sands

    Sand dunes can provide scientists with clues about ancient patterns of wind and precipitation.