Okay, so that title is a bit silly. Hopefully, though, you could tell that it dealt, on some level, with Medical Subject Headings! The 2011 MeSH are (is?) now availabe via the NLM website. Why does this matter? MeSH change every year--there are new descriptors, changed descriptors, and deleted descriptors. The National Library of Medicine endeavors to use accessible and appropriate language in its controlled vocabulary, which means that it must always be changing in order to reflect that.
A full history of MeSH can be found here, but all you basically need to know about are the changes, which again, are available on the NLM website linked above.
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