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New Model of the Universe: It’s Shaped Like a Soccerball. “Since antiquity, humans have wondered whether our universe is finite
or infinite. Now, after more than two millennia of speculation,
observational data might finally settle this ancient question.”
By Dennis Overbye. [New York Times: Science]

This may not have much to do with “sustainability” in the time scales
of humans and nations and civilizations, but it sure is fascinating
stuff, imho.