  Electrons/atoms can flow without dissipation at low temperature in
superconductors/superfluids. The phenomenon known as
superconductivity/superfluidity is one of the most important discoveries of
modern physics, and is not only fundamentally important, but also essential for
many real applications. An interesting question is: can we have a
superconductor for heat current, in which energy can flow without dissipation?
Here we show that heat superconductivity is indeed possible. We will show how
the possibility of the heat superconductivity emerges in theory, and how the
heat superconductor can be constructed using recently proposed time crystals.
The underlying simple physics is also illustrated. If the possibility could be
realized, it would not be difficult to speculate various potential
applications, from energy tele-transportation to cooling of information
devices.
