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My hypotheses regarding this being a fraud (or other than it seems) are getting less tenable. The number of people involved and the scope of it are becoming an issue, for example. A scammer has only a limited opportunity to make money, and the fewer the associates to divvy up the $$ the better, so as more working associates (with legitimate backgrounds) turn up as part of this, the potential for it being a scam diminishes.
Not to mention the report showing observers being able to pick up and inspect the E-cat, check for electromagnetic radiation, etc., that I posted yesterday.
If it's a fraud, no one has been able to explain how they are doing it, nor has there been any discovery of such over four months of demonstrations. There are a number of parties involved, and Rossi is not asking for money (or giving 'opportunities' for licensing, etc.) and appears to be content to let the large-scale demonstration convince people.
I'm left with a secondary/circumstantial points (the 'natural' copper isotope ratio in the reaction product sample, the Petroldragon and gold importation past, and a lot of you-should-have-done-it-this-way carping by skeptics about technical points of the past demos).
As Sherlock Holmes would say, once all other options are ruled out, the truth remains. My assessment of the E-cat is starting to raise above the 50% likelihood mark... the world's going to change if so.