[quote]    Not one, but two further explanations of why I think frequency is the answer:

    There's a manmade product called a "Powerball", they're used for keeping fit, they're a handheld ball that you spin-up and they feel like they've gained weight enough to replace a dumbell.  The apparent weight gain is due the forces generated by the gyro inside the ball.  These things are light enough you could blow one across a table-top with your own breath, but once the frequency going on inside it goes from being zero to, say 280Hz, it becomes something with weight.[/quote]

No, it does not.

Inertial resistance is not mass. (https://en.wikipedia.org/wiki/Inertia)

The Universe is infinite, at least as much as would matter for the sake of thinking about it. And, what's "outside" of the Universe? That's really a nonsensical question, isn't it? In order for there to be an "outside" definable as such, we have to use rules that apply to our common-sense experience of the "inside" of the Universe. Common sense is not common when it comes down to cosmology. If there is an "outside", it's not likely to be easily definable by our pitiful "inside" rule-sets. And, it probably wouldn't allow for our existence or even be something that we could possibly take notice of.

There is no one definable "frequency." Anything can have a "frequency." https://en.wikipedia.org/wiki/Frequency What's important is what's exhibiting that frequency, not the frequency itself. Very high frequency electromagnetic radiation can be very dangerous. A very high frequency mechanical motion of a car's engine can be dangerous, too. But, they're dangerous for different reasons and have properties appropriate to the forces involved.

PS - I hate this forum's software, interface and just about every other technical aspect of this forum's software and environment. Sorry for the mini-rant, but this forum's design and software is just not conducive to conducting open public communication. Somehow, that doesn't surprise me... Sorry for any formatting errors and such. It's the fault of this terrible forum and not my composition! :)