News

  1. Oceans

    Earth got first whiff of oxygen 3.2 billion years ago

    Photosynthesis by early cyanobacteria pumped oxygen into Earth’s oceans 200 million years earlier than once thought, new geochemical analyses show.

    By Thomas Sumner
  2. Environment

    Molting seals shed mercury along with fur

    Seals spew amassed mercury when they shed, creating hotbeds of pollution in otherwise pristine coastal environments.

    By Beth Mole
  3. Materials Science

    Graphene shows signs of superconductivity

    Ultrathin sheets of carbon can conduct electrical current with no resistance at low temperatures.

    By Andrew Grant
  4. Environment

    Latest BPA replacement seeps into people’s blood and urine

    Replacements for BPA called BPS and BPSIP may raise health risks for cashiers.