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  1. Animals

    This ancient marsupial lion had an early version of ‘bolt-cutter’ teeth

    Extinct dog-sized predator crunched with unusual slicers toward the back of its jaw.

    By Susan Milius
  2. Astronomy

    Most complete map of Titan reveals connected seas and cookie-cutter lakes

    The latest map of Titan, based on all the data from the Cassini spacecraft, displays new details about the moon’s lakes and seas.

    By Lisa Grossman
  3. Health & Medicine

    When tumors fuse with blood vessels, clumps of breast cancer cells can spread

    Breast cancer tumors may merge with blood vessels to help the cancer spread.

    By Tina Hesman Saey
  4. Physics

    Some high-temperature superconductors might not be so odd after all

    Unusual high-temperature superconductors might be explained by standard superconductivity theory.