What is Reality?

The definition of total nothingness is necessary for the "theory" of existence, because there is the necessary requirement for the explanation of causality. "Before and after". Cause and effect.Exactly what is nothingness if reality i.e. the universe, started to exist at the point in spacetime t=0 ?Since "before" is a state of existence and there was no existence "before" reality, reality must have created itself.Time could be a sequence of "states" of existence. In accordance with the "syntax" of reality. Superposition and actuality, with every moment in immediate contact with every other moment.Deterministic constraints juxtaposed with self configurative freedom.Russ

Sigh. This is a logical fallacy known as reification of zero. Find out why, and that should answer your questions.

You need to read about brane worlds. This is a new idea that there was time before time. Well there was matter and energy before out universe was formed. It’s like our world is in a bubble or a membrane inside a bigger, possibly infinitely large one. It has to do with quantum fluctuations. You could think of it as boiling water. Once the bubble gets enough energy it finally makes it’s way to the surface. Likewise when our universe got enough energy from quantum fluctuations it POPED into existence. There are probably endless amounts of universes out there. The problem is that it’s hard for humans to understand forever and infinity because our lives are based of birth and death

and that we are constrained by 3 dimensions.

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You need to read about brane worlds. This is a new idea that there was time before time. Well there was matter and energy before out universe was formed.

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Brane-theory isn't all that new. It is a formulation of string theory in two dimensions instead of one. As with string-theory, there is no complete model and no known way to test the idea. It doesn't make observable predictions, so the idea sits in limbo. And there are competing models such as various forms of super-gravity. It is an interesting idea, but hardly what one would call well supported.Brand theory does not postulate 'time before time.' Time remains a function of our universe. That there may be something outside of that universe does not imply that there is time outside of it.------------------
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String theory does predict extra dimensions

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I've read (Scientific American) that there is work being done to measure the force of gravitational attraction at distances of less than 1mm, but no deviation has been found so far.

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I think I have read something about that too, now that you mention it. I'll have to look around later.------------------
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John,Here's a good article on the latest developments in brane theory:Edge: THEORIES OF THE BRANEPE