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 while 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 while insisting that it was not due to contamination. |