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 I think this is a really interesting point because in terms of scale, as a whole we tend to think about adaptation as something that occurs slowly but surely, over periods of thousands of years. I think it's also interesting to "zoom in" and take a look at how we adapt on a smaller scale. I also found it interesting when Professor Grobstein was discussing how reactions from millions of years ago are the basis for molecules today. Again, in most of the science classes that I've been in evolution has bee taught as a slow moving process- and for the most part the occurrences of the past remained in the past, I've never thought how things that happened so long ago effect us now.