Richard Lenski is best known for his 20 year old E. coli experiment in which he claims to have captured evolution in progress, saying that bacteria made minor changes in the long-term laboratory study, insisting that it was not due to contamination. | Richard Lenski is best known for his 20 year old E. coli experiment in which he claims to have captured evolution in progress, saying that bacteria made minor changes in the long-term laboratory study, insisting that it was not due to contamination. |