> It would be interesting to calculate the energy required

After so many hoaxes I'm skeptical. I found his comment
about saxamaphone notes interesting

"The glasses will tinkle on one note. Knives and forks in
the drawer will tinkle on another note and I realised that
everything has its point of vibration," he said. "In the same
way, a component in the ball is tuned to a certain frequency."

Isn't that how how microwave ovens excite water molecules,
only at very high frequency ? It's hard to imagine what could
be in that ball that's been around for over 25 years. Perhaps
an over-driven (can you ?) ultrasonic piezo. But I've used
those baths for a long time and never noticed any significant
heating. Certainly not near-instantaneous local boiling

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