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  1. Health & Medicine

    Gel shows promise against HIV

    Scientists have developed the first topical treatment that can prevent HIV infection among women.

    By Gwyneth Dickey
  2. Life

    Stuck in the past

    Reprogrammed stem cells retain molecular memories of their former identities, two new studies show.

    By Tina Hesman Saey
  3. Life

    This won’t hurt a bit

    A new technology delivers vaccines through a Band-Aid–like patch.

    By Laura Sanders
  4. Chemistry

    Different strokes

    Though they share the same design, new micromachines are not a synchronized swimming team.

    By Laura Sanders
  5. Psychology

    DNA variant may make heavy boozing a team sport

    People who inherit a particular gene variant may find it more appealing to drink a lot of alcohol when they see others doing so.