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Published online 5 March 2002 | Nature | doi:10.1038/news020304-2
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One-way street planned for heat
Physicists design material that conducts one way and insulates the other.
European physicists have sketched out a blueprint for a valve that lets heat pass only one way. The proposed material conducts heat flowing in one direction, but also behaves as an insulator, stopping it going the other way1.
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