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  • 16 Oct 2000

    Harmless bacteria can be engineered to ward off infections

  • 15 Jun 2000

    The population of a migratory bird species drops dramatically whenever El Niño, everybody's favorite source of strange weather, raises its head. If the population of endangered species fluctuates the same way, El Niño could speed their demise, researchers say.

  • 2 Jun 2000

    Even with a hearing aid turned to full volume, some elderly people can't make sense of speech. Now researchers suggest that the brain, not just the ears, is to blame.

  • 22 May 2000

    Life for early humans must have been stressful, between all that foraging for food and seeking safe shelter. But a new study suggests they probably didn't suffer from ulcers.

  • 1 Sep 1999

    By boosting levels of a single protein in mouse brains, researchers have made the animals better at memory and learning tests. They say the finding, reported in tomorrow's Nature, could be used to breed smarter animals.

  • 19 Jul 1999

    Ocean temperatures off Tahiti and Madagascar can predict outbreaks of disease in Kenya, according to a study in the current issue of Science (16 July, p. 397).

  • 3 May 1999

    When viruses invade, the immune system typically adopts a slash-and-burn policy, rounding up viral particles and destroying infected cells.