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  1. Health & Medicine

    Start cholesterol tests in childhood, new guidelines say

    The idea is to control bad cholesterol early in life. Additional tests are also recommended to provide a clearer picture of risk.

    By Erin Garcia de Jesús
  2. Space

    NASA races to have the first moon base and nuclear-propulsion spacecraft

    A $20 billion plan for a moon base by 2030 and the launch nuclear-propulsion space exploration raises hopes, but caution given deep government cuts.

    By Nikk Ogasa and Lisa Grossman
  3. Animals

    When were dogs domesticated? The oldest known dog DNA offers clues

    Two new studies suggest that genetically stable dogs were living among humans in Europe by about 14,000 years ago.