MAGNETIC FLUX at low levels, seen here penetrating a film of magnesium boride, destroys the
material's superconductivity.
Image: T. H. JOHANSEN ET AL. University of Oslo
You can buy magnesium boride ready-made from chemical suppliers as a black powder. The compound has been known since the 1950s and has typically been
used as a reagent in chemical reactions. But until this year no one knew that at 39 degrees above absolute zero it conducts electric current perfectly¿it is a
This article was originally published with the title New Trick from Old Dog.
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