

That piece of punctuation can get a good argument going. Stack some words up to modify a noun, and you may need a hyphen. That's where the debate can begin, but most agree that a hyphen is not needed between an adverb and an adjective. Consider the "-ly" as the glue sticking these words into one idea. Adding a hyphen would be redundant to that task.
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UPDATE: A Chicago Tribune critic reviews the new Huffington Post, comparing it favorably with Google News.