Now the Mudcat mystics would have us believe that the universe consists of two different types of things mater and for want of a definable word "Spirit".
Now if these two things interact at all scales then when we experiment on mater what we discover is not just the properties of mater but the properties of the mater-spirit complex and therefore the discoveries of Physics are correct and apply to the universe.
If however this spirit stuff only interacts with matter that has a mind buy what mechanism does it effect mind and mind affect spirit.

In short would the universe be any different if we discard the concept of spirit entirely.

And please give some evidence that is at least in principal testable.

PP