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  1. Animals

    This sea slug makes its prey do half the food catching

    Nudibranchs’ stolen meals blur classic predator-prey levels.

    By Susan Milius
  2. Astronomy

    Hot, rocky exoplanets are the scorched cores of former gas giants

    Hot, rocky exoplanets are probably the scorched cores of former gas giants, so astronomers shouldn’t trust them for information about true Earth twins.

    By Lisa Grossman
  3. Science & Society

    Trauma surgeon studies gun violence stats — and was one

    Joseph Sakran is trying to help counter the U.S. epidemic of gun violence with data.

    By Aimee Cunningham
  4. Life

    Hybrids reveal the barriers to successful mating between species

    Scientists don’t understand the process of speciation, but hybrids can reveal the genes that keep species apart.