unobtainium

• Engineers often dream up ingenious devices that can only be built with "unobtainium" or "no-such-thingium." —  Analog SFF, September 2006
• From the conventional to the aluminum to the unobtainium, it's the place to be to talk shop and meet fellow riders.
• The dollar will collapse to the point that imported goods, even cheap, shoddily made Chinese ones, might as well be made of unobtainium. —  QandO
• : There are alternatives to a Space Elevator that don't require materials made of unobtainium. —  Futurismic
• Whether you ride a rusty craigslist special or a feather-weight racing machine composed of unobtainium, you will receive the same great service at a very reasonable price. —  blogTO

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