Friday, March 1, 2013

A spiral through frozen helium

A spiral through frozen helium:

This spiral is a crystal of silicon carbide, made during an experiment conducted in 2007...

There are flaws in the crystal, and, when the mixture reached a certain temperature and pressure, the solid helium turned to a superfluid.

...The crystal of frozen helium was twisted around, and suddenly the twisting got easier, as if some of the mass had disappeared.

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