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  1. Tech

    More bang for the biofuel buck

    Microbes that ferment glycerol to ethanol could add an economically valuable new ingredient to the biofuel industry.

    By Sarah Webb
  2. Earth

    As the last ice age waned, a great lake was born

    Lake Agassiz, a huge and now vanished freshwater lake, formed almost 14,000 years ago, toward the end of the last ice age.

    By Sid Perkins
  3. Health & Medicine

    Hepatitis B drug creates HIV resistance

    A hepatitis B drug spurs resistance to HIV drugs in people infected with both diseases.

    By Carolyn Barry
  4. Chemistry

    Gooey solution to a sticky problem

    A new, gooey, and potentially useful protein has been extracted from the bodies of jellyfish that overpopulate the seas around Japan.