Do carbon nanotubes and Kron's negative resistor have physical basis?

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Nereid
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From wikipedia, there is a reference to "composite configuration of carbon nanotubes which appears to exhibit anomalous results which resemble a static negative resistor", and "Gabriel Kron, while a scientist for General Electric, is thought to have built a negative resistor for the US Navy's "Network Analyser"."

Is there more to this (or is it a 'fringe' case)? If the latter, does it really belong in wiki?
 
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it's not a fringe case. look up the tunneling diode link at the wiki article. tunneling diodes do have a (U,I)-region like that.
 
Tunnel Diode is not a static device, its Imposssible within the laws of Physics to have a static negative resistor.
 
As far as I can understand the Wikipeida arttical it's talking about negative differential resistance and therefore I don't really find it unbeliavabele (perhaps a bit unusual).
 
Yes, negative differential resistance means that although it has a positive
resistance, a slight increase inthe voltage causes less current to flow.

A true negative resistance supplies power.