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  1. Physics

    This is your brain on a chip

    Biophysicists have put neurons on a chip and induced them to form multiple patterns of synchronized firing, the mechanism at the basis of memory.

    By Davide Castelvecchi
  2. Astronomy

    Eclipsing a black hole

    A chance eclipse has enabled astronomers for the first time to measure the width of a disk of swirling, hot matter around a supermassive black hole.

    By Ron Cowen
  3. Earth

    Increase in chemical disposals

    Industrial facilities in the United States released more than 4 billion pounds of chemicals into the environment in 2005, according to the Environmental Protection Agency's Toxics Release Inventory.

    By Aimee Cunningham

  4. Psychotherapy aids bipolar treatment

    Any of three forms of psychotherapy enhances emotional stability in people with bipolar disorder who already receive standard medications for that severe psychiatric ailment.