Oh right, thats what you mean, sorry. Yep, very old experiment, the 'observer effect' etc too. Theory. Thats the word basically, yep, kind of the same as faith. Even the particles the LHC will observe are still called 'theoretical particles'. They're more 'fields' than 'particles' in the normal non-physicists understanding of the word 'particle' really. However, the thing you mention does have a physical experiments that backs it up, reinforce the theory as more likely. I mentioned string theory as that will never have experiments that could back it up so its more akin to leap of faith. Albeit a leap of faith based on easily rejigged math.

I think you mean Tesla on clairvoyance/science. Interestingly there have been a batch of experiments done recently with the effects of electromagnetism on people. They described feeling that there was someone else in the room with them when there wasn't, and in some cases seeing ghosts when exposed to certain fields. Can't find the paper at the moment though, annoyingly.