What Is An Expert?

Reading books and articles across the internet on all manner of topics, it is clear that there are many "experts." At least, that is what they represent themselves to be. Some legitimately are experts (Ron Shandler, the folks at Baseball Prospectus for example--and there are others whose exclusions here are not important) and some aren't. In political blogs there are all manner of "experts" at least in their own minds (Barbra Streisand anyone?). But what makes an expert??

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