tag:blogger.com,1999:blog-1782201568211911934.post-48145170012982888052008-02-22T08:32:00.001+01:002008-05-12T07:45:35.532+02:00

Often when I lecture about evolutionary biology, a member of the audience will say, "You don't have a time machine, so you can never be sure about what happened long ago, this is all this speculation."Well, it is hard work, and often no experiment can conclusively differentiate the hypotheses. However, sometimes one can be as sure as sure can be.Paleontologists have long recognized a major

Randolph Nessenoreply@blogger.com1