Italian scientist Andrea Rossi has spent the past year giving demonstrations of a device that he claims can generate large amounts of energy due to a little-understood nuclear process. His latest demonstration, performed on October 28th, has attracted some of the most mainstream media attention yet, with coverage by outlets including Fox News, Forbes, and MSNBC, among others. But the big question still seems to be whether Rossi’s E-Cat (energy catalyzer) device is a huge breakthrough or a huge scam. What’s making the answer so difficult to determine is the lack of a clear, scientific explanation of what exactly is going on.

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