Ah, but what if we're not limited?* Consider this: Our
   imaginations.* What are they?* Let's take a biological
   perspective: Our imaginations are physical: They take place
   within a blob of fatty stuff that sits on top of a stringy
   nervous system, that is connected by muscles and various inputs
   that interact with our environment that we find ourselves in.
   The chemicals that squirt in the fatty mass, the axons fibers
   that protect the signals, the synapses - these are all physical
   systems that are very real; even somewhat measurable in our
   current limited technologies. Now... within our imagination,
   which, from this point of view, takes place within very real
   bodies that very much exist here, where we are, we are capable
   of Time travel.* Within our language, we speak of past, present
   and future, we have concepts that go far beyond what we have
   experienced; we can even experience the thoughts of someone who
   has long since died because they have written it down, in a
   language our physical brains can comprehend. So; is Time Travel
   possible?* In this context, yes.* In fact, Time Travel is so
   commonplace, we take it for granted; we use it all of the time
   and *never even give it a second thought*. Yet we also say "Time
   travel is impossible".* Why? Because somewhere along the line (I
   actually know the source - I want to say Aristotle, but it might
   have been Plato, I'm not sure) - the concept that "mind" and
   "body" are separate entities came into play and has influenced
   our assumptions about Reality ever since. I believe that there
   *are* no limitations that are fundamental; but we may have to
   deconstruct our assumptions about Reality and Truth and rebuild
   them to find the possibilities. And it can all be done perfectly
   scientifically, should one choose. Bias: I am a fan of Embodied
   Cognition.