They are, in effect, internal viruses unable to leave a cell because they lack the protein coats that allow real viruses to survive in the outside world and attach themselves to new host cells, but contributing nothing to the welfare of the cells they inhabit.

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As part of their investigation, Japanese and U.S. experts want to determine if an internal battery failure, or defective lithium-ion cell, was the ignition source in either of the two incidents.

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"Lots and lots of things are happening that indicate a worldwide interest, and most of the knowledgeable people are convinced that the next-generation replacement for the internal combustion engine is going to be a fuel cell, " Roan said.

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It can be used to run an internal combustion engine in a car or power one using a fuel cell, with heat and water as the only emissions.

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The technology isn't new-a patent for a hydrogen internal combustion engine was issued in 1928, and a 20hp fuel-cell tractor was demonstrated in the late 1950s.

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The internal duplex microphone allows for hands-free speakerphone calls with most any Bluetooth cell phone as well as compatibility with FaceTime, iChat, Skype and other applications.

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Burns says a fuel-cell vehicle has one-tenth the number of parts of a traditional internal combustion engine.

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