It's educational - really :)
Have you taken a look at Second Life yet? It's what they call a Massive Multiplayer Online Game - essentially a vast, earth sized virtual world where you can wonder around and do pretty well anything that it is possible to do in reality.
Educators are starting to look at this with interest - and here are some of the leading locations within second life where interesting things are being done - everything from functioning ecosystems to looking at heart murmurs.
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