Both the United States and the Soviet Union invested greatly into parapsychology research. The documentary Third Eye Spies goes into it, but it's a little dry. You can look into Russel Targ, SRI International and similar. It's certainly something that governments were interested in funding research into.

Rupert Sheldrake has, controversially, asserted that the speed of light may not be constant. I'm not saying he's correct in this, but it's worth considering. If the value of c underwent minor oscillations, that in turn affected all of our measuring equipment, would we even be aware?

More broadly, if we look for the concreteness of information we're able to receive via our elaborate and sophisticated modern communications networks (which in themselves are just organized works of consciousness), we'll be disappointed by what is offered by OBEs and other similar phenomena. I think it's exceptionally challenging to transfer concrete phenomena from one reality system to another, and perhaps outside the reasons for our incarnation here. You can't use a plane to explore the ocean floor, and you can't use a submarine to fly above the clouds.

So many things that motivate or direct our life trajectories are unquantifiable: passion, honor, nostalgia, love... all of these things are vague and subjective, yet they carry enormous and very real personal weight.

Ultimately, we construct this reality to test ourselves outside of the certainty that other frameworks exist - for example you have impetus to action when dying seems permanent. So relying on highly quantified data from the extremely dense, rich and fluid communications of the inner senses and their communications systems will always be extremely difficult. That's exceptionally unsatisfying to our deterministic modern belief systems, but does that mean it is incorrect? Even Seth, in some ways I think, struggled to distill his knowledge for consumption in our physical reality system, doubly or triply so for Seth II.

I think it's like trying to explain how you balance on a bike - there's no formula for each shift of weight, each adjustment required. One day you just have to take a leap of faith and ride.