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  1. River dolphins can whistle, too, sort of

    In the most elaborate attempt so far to eavesdrop on Brazil's pink river dolphins, researchers have detected what may be a counterpart to seafaring dolphins' whistles.

    By Susan Milius

  2. Do parents with extra help goof off?

    When researchers stepped in to help feed baby sparrows, the parents did not slack off but brought even more food.

    By Susan Milius

  3. New robot frog gets into fights

    Researchers have finally managed to build a robot frog that can provoke male frogs to attack.

    By Susan Milius

  4. 18964

    Although the physiological basis and purpose of dreams may be uncertain, we need to recall that Freud was more interested in what his patients said about their dreams than in the dream content itself.