@Setanta,
We can't see the non-physical realm and we can't measure it either however there is evidence in its existence in the phenomenon of ESP inside of relationship. At present in the investigation of ESP the biomedical scientissts are creating a triple jeopardy for the subjects. First they are relationally distancing them, ie the experiments are double blinded and they insist that this is a standard to make the experiments scientific. That is garbage. The ONLY condition that makes an experiment scientific is a control experiment. Thus in the scientific methodology we use the test conditions and see what we get then we remove the test conditions and see what we get. If when we remove the test condition we get no result we can feel reasonably confident that the results we get are due to the test conditons. For ESP our test condition is relationship so we should only use double blinding for the control NOT for the experiment.
Next they have the subjects guessing, which means the areas of the brain used for thinking are most active while those for perception, even sensory perception are less active.
And thirdly they have the subjects guessing symbols or numbers etc on cards that are being viewed passively by another subject. No symbol or number etc is going to be relevant to a person as to make them highly perceptive.
In real life if we are faced with some nebulous situation that presents some danger we get "a bad feeling". This is ESP and we become conscious of it because it is relevant. In the so-called precognition experiments subjects display distress when a computer is about to choose a distressing image to display on the screen and they explain it away as predicting the future.
There sure is evidence of ESP and this cannot come about by physical considerations alone. There is no energy that can go out of one person's brain and into another's. No physical law allows for it. The only way that we can be perceptive of ideas is if those ideas exist in a mind which is both the non-physical realm AND common to all.
I suspect that ESP is being denied because it is a part of the evidence that exposes the real causes of the major diseases and that is the maltreatment of a person through a toxic relationship. The exposure of the real causes of diseases means people can help themselves get well and there is no money for the medicos in that!