If there are limitations to our imagination and we cannot think of something that does not “exist”, then the formulation of anything we imagine has to have a bases of existence and of realism.

Secondly, what percentage of “science” has man discovered, and how much is there still to be discovered? 5%, 10% of the whole understanding of science?

**Response:**Human brains are finite so there are clear limits to our thought. But we can certainly think of things that do not exist – and indeed could not exist.

I don’t think we can say what percentage of science is to be discovered: the more we know the more questions we can ask and, as we wrote in Questions of Truth science has a fractal character. What we have discovered is finite and what remains to be discovered is infinite so strictly speaking 0% of science has been discovered so far. But that’s not really very meaningful, and clearly some the things that remain to be discovered are less important than others. So to give a rough picture we might say something like “about 4.64% of science has been discovered” and hope people would get the mathematical joke about the cube root of 100.

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