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  1. Earth

    Weekend weather really is different

    Analyses of more than 40 years of weather data from around the world reveal that in some regions the difference between daily high and low temperatures on weekend days varies significantly from that measured on weekdays.

    By Sid Perkins

  2. Mothers reveal their baby faces

    Mothers in different cultures use three distinctive facial expressions to communicate with their infants.

    By Bruce Bower

  3. Rats join the roster of clones

    Scientists have finally cloned the rat, setting the stage for the creation of genetically engineered rats that can be used to study many more diseases in humans.

    By John Travis
  4. Health & Medicine

    Making the heart burn

    Burning chest pain during a heart attack may stem from a protein that also responds to chili peppers.