Carl Zimmer has this lovely post on the Lenski lab work on E. coli evolution, and look! The first author on that paper, Zachary Blount, showed up with an offer to answer any questions!
But sadly, you should also look at who the first person to take him up on the offer is: Larry Fafarman. If you don’t know of him, you’re fortunate. He’s a mentally ill, permanently obtuse, persistent freakazoid creationist who, given a chance, will run the rational discussion right off the rails.
If you’re interested, get on over there and counter Loony Fafarman with some intelligent discussion, ‘k?