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  1. Diesel gases masculinize fetal rodents

    In rats, exposure to diesel exhaust perturbs pregnant moms’ sex-hormone production and makes her pups more masculine in certain ways.

    By Janet Raloff
  2. Tech

    Simple system may curb auto emissions

    Researchers have developed a four-component system that acts like an on-vehicle oil refinery and may help significantly reduce the hydrocarbon emissions from internal combustion engines.

    By Sid Perkins
  3. Astronomy

    Peering at black holes: An eventful look

    Two new studies provide supporting evidence for event horizons, the one-way membranes that surround black holes.

    By Ron Cowen

  4. First gene-altered primate beats the odds

    Oregon researchers have slipped a jellyfish gene into a rhesus monkey to create the first genetically modified primate.