Might make an interesting approach to a 3D display, if the light and bubble vibration were synchronized. https://en.wikipedia.org/wiki/Cymatics https://en.wikipedia.org/wiki/Ernst_Chladni#Chladni_figures

I'd have to run the numbers, but my gut reaction is that that would require a LOT of Neutrons, and probably a Neutron source much larger than the fuel load. Plus, creating Neutrons, especially in that number, is going to be somewhat energy intensive, even with something like Alpha particles bombarding Beryllium. Plus, as the fuel element is used, the efficiency will decrease, as the fissile material is poisoned by fission products. That will require even more Neutrons, and Neutrons are, in general, bad news, since they can induce radioactive products, even in materials which aren't naturally radioactive. So, disposal of the spent fuel element is going to be a major headache. And, that's not even getting into Neutron embrittlement of the reactor support elements. And, that's not even getting into things like the Wigner Effect. And, the Wigner Effect was the cause of the British Windscale fire/disaster, which, while it wasn't technically a meltdown, produce a vast release of radiation as the core thermally burned. Don't do that! https://en.wikipedia.org/wiki/Wigner_effect https://en.wikipedia.org/wiki/Windscale_fire I have to wonder, though, if those AI data centers wouldn't be better served by something like a CANDU nuclear reactor, which uses natural Uranium (rather than enriched Uranium), and depending upon the highly efficient moderator of Deuterium Oxide (Heavy Water). In the event of a disaster, as the Heavy Water drains out of the core, it reduces the moderation of Neutrons, resulting in the reactor shutting down (There may still be a meltdown, but the meltdown will, almost certainly, be less severe than with a reactor fueled with enriched Uranium). https://en.wikipedia.org/wiki/CANDU_reactor Or, something like that.

@Shawn Carlson I, too, would be a little amazed if it would work across a number of brands and models. Besides, most brands have optimized their electronic controls to maximize fuel economy, although many of them do stupid things, such as shutting the engine down at stops (which puts an incredible load on the starter), and dynamically varying the number of cylinders being fired, which places a heavy toll on the valve train (and, reportedly, causes vastly decreased engine life!). But, I can't/won't condemn it before more facts are presented.

@Patrick Barthelow Tex Johnston did this in the Boeing 707, as part of a demonstration to potential airline customers. He quite upset the president of Boeing with this unplanned maneuver, although he explained it as "I was selling airplanes". As such, it had to be performed fairly close to the ground, so that the ground (yacht) based observers could see it. https://en.wikipedia.org/wiki/Boeing_707#Development https://en.wikipedia.org/wiki/Alvin_M._Johnston#Boeing_Company