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  1. Animals

    Ravens pass tests of planning ahead in unnatural tasks

    Clever birds may have evolved their own broad powers of apelike thinking about the future.

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  2. Neuroscience

    Brain activity helps build an alpha male

    In mice, nerve cells in the prefrontal cortex influence whether an individual is dominant or submissive.

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  3. Climate

    Rising temperatures may mean fewer passengers on airplane flights

    Global warming could force airplanes to carry a lighter load — and fewer passengers —on each flight.

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  4. Earth

    Delaware-sized iceberg breaks off Antarctic ice shelf

    An iceberg about the size of Delaware splintered from the Larsen C ice shelf in one of the largest calving events ever recorded.