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Neal's post Static Typing is Communist Bureaucracy has drawn out the usual arguments on both sides of dynamic vs. static typing debate. I fielded many of the same kinds of questions at my Rails for Java Developers talk at Java University. One of the most common questions asked by people moving from static to dynamic languages is "How can I tell what the code does without the type information?" This is a good point! Static typing makes code readable, just like training wheels make a bicycle ridable. But eventually you want more than not-falling. You want elegance and speed.