Just on this point I was thinking recently about the speed of light from another area of my reading. The question was asked why is the speed of light the particular speed it is ie why not 10klm faster or slower

Then it struck me from a remark made it

**HAS **to be the exact speed it is. It is a inbuilt feature and

**cannot** be otherwise

Consider E = mc²

We know Energy cannot be created or destroyed so it would appear what the total energy content of the Universe has

**ALWAYS** been such (in different forms sure) but in total always the same

So extracting the energy from mass by the formula E = mc² will always provide the same amount of energy from the same amount of mass

And that will happen

**ONLY** if the speed of light remains invariant

I'm still trying to refine the thoughts about this into more explanatory terms (rather than mathematics) but it appears to me at the absolute bedrock of physics would be the speed of light