Funny you should mention fruit flies, Laura.

For it is with them that some of the limits of mutation and genetics have been shown. This link is a bit over the top, but it gives you the idea. Evolution in the laboratory shows only very minor changes with some very definite boundaries.

Here 's a site that's a bit less extreme.

And you are not distinguishing between microevolution -- which has indeed been demonstrated both in the lab and in nature -- and macroevolution which has NOT. And it's not merely a question of time. There are fruit fly strains that have been bred in labs for thousands of generations.

Do you know the most surprising thing about divorce? It doesn't actually kill you, like a bullet to the heart or a head-on car wreck. It should. When someone you've promised to cherish till death do you part says, "I never loved you," it should kill you instantly.

- Under the Tuscan Sun