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  1. Cries and Greetings

    Baboon intimacy and detachment present vexing clues.

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  2. Humans

    Nobel prizes honor innovative approaches

    The 2002 Nobel prizes pay tribute to an international sampling of scientists who developed powerful new techniques for expanding the horizons of research.

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  3. Physics

    Cooled device unveils a quantum limit

    A novel suspended device chilled near absolute zero demonstrates the existence of a basic unit, or quantum, of heat conductance—the first evidence of quantum mechanics in mechanical structures.

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  4. Earth

    Lawn Agent Cues Embryo Shortfall: Herbicide weeds out mice in the womb

    Minuscule amounts of over-the-counter weed killers impair reproduction in mice.