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"...the space defense initiative drove the USSR bankrupt, and it originated at my house in Tarzana."
- Larry Niven

Superconductor of Heat  
  A light metal that accepts heat applied to its surface, and then dissipates the energy throughout the material, leaving the temperature of the material unchanged.  

A superconductor is a substance that will conduct electricity without resistance; typically, a very low temperature is required. Electrical current will flow forever in a closed loop of super conducting material

Lafferty used his cutting laser. They stood around watching the narrow green beam do nothing to the silvery casing. Staley wondered: where was the energy going?

He took a thermometer reading. The casing was just less than red-hot all over. When Lafferty turned off the laser the casing cooled rapidly; but it maintained the same temperature at every point.

A superconductor of heat... They tore sheets off with their gauntleted hands.

From The Mote in God's Eye, by Larry Niven (w/J. Pournelle).
Published by Simon & Schuster in 1974
Additional resources -

The obvious advantage of a superconductor of electricity is that there is no loss; the power received at the device is equal to the power generated at the source. A superconductor of heat would make it more efficient to heat specific areas using a centralized system

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Additional resources:
  More Ideas and Technology from The Mote in God's Eye
  More Ideas and Technology by Larry Niven (w/J. Pournelle)
  Tech news articles related to The Mote in God's Eye
  Tech news articles related to works by Larry Niven (w/J. Pournelle)

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