Google Scholar now offers a new sorting option. In addition to the "all articles" sort, top right on the results page, you'll see a new link labeled "recent articles." What's important to realize is that this new option is not a date based sort. According to Google engineer, Dejan Perkovic, who posts on the Google Blog, "It's not just a plain sort by date, but rather we try to rank recent papers the way researchers do, by looking at the prominence of the author's and journal's previous papers, how many citations it already has, when it was written, and so on." Try a simple, unsophisticated search (the way most people search) of Google Scholar for research for avian influenza--first, using the "all articles" sort and then the "recent articles" sort.
Source: Google Scholar Update
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