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  1. Space

    First it’s there, then it’s knot

    Discovered just a year ago, a tangle of atoms at the edge of the solar system disappears before astrophysicists’ eyes, leaving questions behind.

    By Ron Cowen
  2. Life

    New genetic blueprint for bloodsuckers

    Mosquito genome number three could lead to new pesticides to fight the adaptable pests.

    By Gwyneth Dickey
  3. Humans

    Ancient New Guinea settlers headed for the hills

    Humans had reached the rugged land by sea and quickly adapted to the mile-high forested interior by nearly 50,000 years ago, stone tools and plant remains indicate.

    By Bruce Bower
  4. Space

    Distant world could support life

    For the first time, astronomers detect a planet beyond the solar system with the potential to be habitable.