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  1. The Naked Truth? Lice hint at a recent origin of clothing

    A study of genetic differences among human lice hints at the origin of clothing.

    By John Travis
  2. Earth

    Clearing the Air: Ozone-killing bromine is on the decline

    Chemical analyses of Earth's lower atmosphere show that the overall concentration of bromine, a component of some potent ozone-destroying chemicals, has dropped by 5 percent since peaking in 1998.

    By Sid Perkins

  3. Uneasy Breathing: Lung ills linked to suicidal thoughts

    Patients who suffer from asthma and other lung disorders report thoughts of suicide and self-harm far more often than do people treated for other physical illnesses.

    By Bruce Bower
  4. Animals

    Musical Pairs: Egg-deploying bird species divide for a song

    A new genetic analysis bolsters the idea that musical taste, rather than geography, split Africa's indigobirds into multiple species.