i have this theory about parallel universes. you might think its rather warped, but i obviously think not.
i remember learning long, long ago in school that the human eyes are capable of seeing colors only between a certain frequency band. similarly we've also learnt that we also hear sounds only within a certain frequency band. and we are told that other animals can see and hear colors and sounds even beyond these frequencies. now this must be true for all our senses - sight, smell, taste, sound and touch.
this means that we are experiencing a part of the universe/world around us while there definitely exists another part which we do not experience. and just because we do not experience it does not mean that it does not exist! so we could say that we exist at one plane which we experience and there exists one or more other planes that exist which we are not aware of! or to put it differently, we experience a sub-set of the universe and we exist (or at least we believe) within that sub-set.
ok, now here's the hypothesis/question. is it possible that there is an entire universe existing parallely with our universe which we are not aware of, which is beyond the scope of our experience? and is it possible that there are 'beings' in those planes which may or may not be aware of our existence?
i agree that we have devices which are able to measure signals beyond those of human perception. but just like the limitations of our sense organs i believe these instruments would also have a limited scope of 'perception'.
imagine, there must be another 'being' sitting here next to me and chuckling at these conclusions that i am arriving at and another one sitting next to you reading this with you :-)