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  1. Animals

    Techno Crow: Do birds build up better tool designs?

    Researchers surveying tool use by New Caledonian crows propose that the birds may be the first animals besides people shown to ratchet up the sophistication of their technology by sharing design improvements.

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  2. A Tale of the Tapeworm: Parasite ploy suggests drug-delivery tactic

    A chemical used by tapeworms to slow intestinal pulsations may help people absorb drugs more efficiently.

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  3. No Rest for the Waking: Brain cells for alertness fire without cues

    The brain cells that keep people awake fire spontaneously and continuously on their own, suggesting that sleep depends on signals from other brain regions that quiet these neurons.