Room Temperature Superconductivity Found in Graphite Grains - Technology Review: Take a spoonful of graphite powder and stir it into a glass of water. Leave for 24 hours at room temperature and then filter the powder. Finally, bake overnight at 100 degrees C and allow to cool.
And voila! A material that superconducts at over 300 kelvin--room temperature...
The claim from Germany is that the superconductivity occurs at the interface between grains of graphite after they have dried out.
So that's a surface effect which involves only a tiny fraction of the total mass of carbon in the powder--just 0.0001 per cent of the mass...
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