Posted by navi on Wednesday, September 2, 2009 at 1:57pm.
You need to be much more specific with your question. For example, what progress toward what? food, insulation, air travel, air safety, automobiles, and the list goes on. Exactly what kind of progress are you looking for? I suspect if you answer that question you will be able to answer your own question.
It will never be on a test don't worry about it.
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