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  1. 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
  2. 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
  3. 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.

    By Sarah Webb
  4. Planetary Science

    Dust delays Martian rover

    A dust storm has delayed the descent of the Mars rover Opportunity into Victoria crater.