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  1. Science & Society

    Can privacy coexist with technology that reads and changes brain activity?

    An onslaught of new technology aims to listen to — and maybe even change — your brain activity. Readers, scientists and ethicists grapple with the ethical implications of new ways to get inside the skull.

    By Laura Sanders
  2. Archaeology

    Humans made a horn out of a conch shell about 18,000 years ago

    Ancient find may have sounded off during rituals in a cave adorned with wall art.

    By Bruce Bower
  3. Earth

    A drop in CFC emissions puts the hole in the ozone layer back on track to closing

    After a recent bump in illicit CFC-11 pollution, emissions of the ozone-destroying chemical are back down to pre-2013 levels.