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  1. Rats take fast route to remembering

    Rats use background knowledge about what they have already learned to remember relevant new material surprisingly quickly.

    By Bruce Bower
  2. Health & Medicine

    Augmenting the good cholesterol

    A reconstituted version of good cholesterol may lessen the amount of plaque that accumulates in arteries and render existing plaque less dangerous.

    By Nathan Seppa
  3. Planetary Science

    Cavernous findings from Mars

    Images taken by a Mars-orbiting spacecraft show what appear to be caves on the Red Planet.

    By Ron Cowen

  4. Faster, Cheaper, Better

    Methods now under development could make DNA sequencing quicker and less expensive, paving the way for the day when treatments can be tailored to each person's genetic profile.