From what I've read, people have been peeking in on the other side for thousands of years. Some do it on purpose, some do it accidently.

I don't see any good reason to debate whether or not there's something that our receiver isn't wired to pick up. But I tend to think that human beings are limited in their ability to perceive everything that exists.

It's fairly conceited to believe that if we can't detect it, that it's not there.