• 6 February 2009

    Extraterrestrial evolution

    Science writer and author of Microcosm: E. coli and the New Science of Life Carl Zimmer wrote the “On the Origin of Life on Earth”  last month. Today he discusses evolution on other worlds. Imagine you spent your whole life on a tiny island, with only some tortoises and snails to give you a clue to what life was like. You’d… Read More
  • 12 January 2009

  • 9 January 2009

    RNA begets RNA


    Gerald Joyce, Scripps Institute

     As Science‘s essay on the origin of life on Earth points out, many researchers think RNA was central to early life. But one challenge has been to show that RNA could make copies of itself without help from another biological molecule–DNA or proteins, for example–and that it could do this for long enough to allow evolution to… Read More