The Living Force
Generally, interesting experiences. I've always been intrigued by developing psychic abilities. I never focused on remote viewing/time travel. Although I believe it is possible.In this case it was different. My strange friend have sent me a tape. I was listening to the tape. It was kind of a "leading tape", quasi-hypnotic, leading me to the "portal". From the portal I was left alone. Unfortunately I do not have this tape anymore, but any tape would probably do, like Laura is sometimes doing her online "guided meditations". A guidance of some sort is really useful.
As for some techniques that I would be practicing on a regular basis, it makes sense to me to learn to see what is in the other room first. Ask someone to put an object on a chair or table, to then leave the room in the imagination and then see what object is lying there. (I wrote this more with Nem in mind.)
Then, if you have a working technique (created even by your own efforts by trial and error), you can go through "portals" to various, even very distant corners of our Earth, as well as the entire universe, if we are interested in it. Including moving between the past and the future. This is how I would approach it if I had to exercise more regularly.
You attribute these words to Max Planck. If this is true, it sounds quite convincing. These words sound as if Planck knows the situation is quite unusual and "shouldn't" come to that. He recognized you as some form, maybe he saw a physical person, but it was so unusual that he saw you in such a time and place. By which he started to connect you with being some kind of spirit."How do I know, you are a good spirit? How do I know it"
In addition, by his attitude, it can be said that he was open to spiritual matters during his lifetime and took into account that various beings from the other side could come, both positive and negative. (This is probably a fairly common view, by the way.) - Recalling his words: "How do I know it." - he doubts in his assessment of the situation.
I don't know more about the whole incident than you do and I have the right to be skeptical, but I do not exclude that it did happen. I actually think there was something to it. Especially since you tend to be reliable when it comes to sharing things with others.