Lenski is best known for his claim to have observed evolution of E. coli in a long-term laboratory study, insisting that it was not due to contamination. His 2008 paper asserting his claims was peer reviewed in a mere 14 days, sparking questions about the thoroughness of the review. | Lenski is best known for his claim to have observed evolution of E. coli in a long-term laboratory study, insisting that it was not due to contamination. His 2008 paper asserting his claims was peer reviewed in a mere 14 days, sparking questions about the thoroughness of the review. |