Scientists have found water-impregnated graphite posesses certain properties associated with superconductivity.
http://www.nature.com/news/tantalizing-hints-of-room-temperature-superconductivity-1.11443
This doesn’t sound all that promising, really. It sounds a lot more like an observed characteristic thought to be exclusive to one class of material is found to exist in another class. It’s a good thing to discover, since it would further knowledge of magnetism, but unless it actually conducts, it’s not something we can call a superconductor.
But I’ll stop throwing out my pencil shavings just in case.
Here’s the graph with hard numbers.
http://www.technologyreview.com/view/429203/room-temperature-superconductivity-found-in/
They’re not claiming to have discovered a room-temperature superconductor, they’re claiming to have discovered a treatment that causes a change in the magnetic behavior at the surface of graphite granules, a change which they say is consistent with superconductivity. They believe by studying what’s happening at these surfaces, higher temperature superconductors might be developed.