Federal officials are trying to cut down on aggressive or deceptive sales pitches for Medicare Advantage plans.

  What you learn about people ?and yourself ?when you need them to donate an organ.

  Well-designed studies suggest several ways to improve the brain?s viability.

  The ritual of showing how much we care also makes us feel good.

  Mistletoe has a legendary reputation for romance, but it is also widely considered as lethal as it is festive.

  A young girl with a stomach so upset that she was starving.

  What sustainability is really about.

  Cellphone cameras and text messages, social networking Web sites, e-mail and instant messaging, all give teenagers a wider range of ways to play tricks on one another.

  A tour of the human body from morning to night.

  An abrupt move by the federal government has clouded the future of a national treatment program for ground zero workers outside the metropolitan area.

  A provocative public service campaign on children?s psychiatric disorders has raised hackles as much as awareness.

  Lawmakers called for hearings to investigate the rejection of the Dendreon Corporation?s experimental prostate cancer drug.