Welcome to European Tribune. It's gone a bit quiet around here these days, but it's still going.
IIRC, the superconductivity of these materials breaks down when the magnetic field reaches a certain intensity. Also, the materials themselves are exceedingly brittle, and technologies for using them in real-world applications are still in the laboratory stage.

The fact is that what we're experiencing right now is a top-down disaster. -Paul Krugman
by dvx (dvx.clt št gmail dotcom) on Wed Sep 27th, 2006 at 04:18:01 AM EST
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