How is "This was caused by a chemical in the brain" any more rational than saying, "This was a message from beyond."
You are confusing irrationality with paranormal. Just because something is paranormal does not make it incomprehensible or irrational, and it certainly doesn't make it "supernatural"
Everything that can be observed is by definition natural. If we discover that humans have a subtle telepathic ability, it will be a wholly natural phenomenon.
The problem with typical paranormal claims is that they are inconsistent even in the best circumstances. There is no psychic that can reproduce their talent on command or in all situations. There are also external factors that are not respected by conventional science.
For instance if a psychic says, "I cannot have any hardened skeptics actively observing me or in the general vicinity, because their aura creates a null field that blocks out all psychic transmission," and then the tester refuses to set up a situation where those conditions are met (This is what the Randi foundation does) then the tester isn't going to create a legitimate test.
Look at the ordeals that Erin has had to go through - she does not spare any details on her blog about the stuff she has experienced. She can't just reproduce her ability on command in a cold & sterile white room while being observed by 20 cameras and 20 hostile magicians. It won't work for reasons that should be obvious to you if you sincerely read her blog.
Randi, for one, basically refuses to provide the people he tests with suitable conditions. So Randi doesn't solve the mystery.
There is a guy who took a very smart approach to studying the paranormal. He was a professor of physics and engineering, and all he did was compile data for 25 years. He didn't perform tests, just compiled data. Then he assembled the massive amount of data to look for clues, and every skeptic must admit that what he found is very intriguing and worthy of more studying. At the very least it says incredible things about the human mind - stuff that modern psychologists are not able to rationalize away.
Are you willing to take the red pill and see just how deep the rabbit hole goes? Or are you just here to taunt some crazy nutjobs? "The information in this book is either nonsense or it is the most centrally important thing that you could possibly learn." http://www.llresearch.org/library/se...of_the_ufo.pdf