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Lenski, a professor of microbial ecology at Michigan State, is best known for his work on what's known as the long-term evolution experiment. The project, started in 1988, examines evolution in action. He and his lab members have been growing 12 populations of E. coli continuously for over 65,000 generations, tracking the development and mutations of the 12 separate strains.

The results have garnered attention and accolades--including a MacArthur "genius" grant, which Lenski received in 1996--both for the enormity of the undertaking and for the intriguing findings the study has yielded. Most notably, in 2003, Lenski and his collaborators realized that one strain of E. coli had evolved the ability to use citrate as an energy source, something no previous population of E. coli was able to do.

Lenski is also interested in digital organisms, computer programs that have been designed to mimic the process of evolution.

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