I apologize, Pamela, but no I was not referring to deja vu. What I was referring to, is a complex matter that occurs when a single mind (person) experiences temporal displacement, aka 'time travel', or, probably more accurately defined as a sort of 'reality shift', multi-verse phenomena, etc. In any case, the point at which a test subject returns to what you would call "now", he or she can, and will, notice very slight variations in their perceptual experience (most things appear as they did before, but some appear slightly altered. The current theory is that they are not returning to exactly the same 'time frame' if you will, but instead, a very similar frame of reference which has evolved in a slightly different way. Physics and quantum mechanics predict this property; however, how the human mind reacts to such a situation can never be predicted. Now, the same scenarios also exist during experimentation, wherein, the test subject travels to 1910, and experiences what he or she believes to be the exact historical 'time frame'. In fact, he or she is experiencing a very similar, but not exact replica of the [so-called] historical time frame. The current theories suggest a multi-verse situation, as shown through numerous experiments and the experiences of our test subjects, instead of an actual "movement backward in 'time' <whatever that term mean. Now, the experience, for all intents and purposes, is correct enough to be considered the best possible experience of 'time travel'. Photographs and physical artifacts have been returned successfully, strongly suggestive of actual 'time travel'. (see my avatar icon: Paris aviation exhibition - 1908) What I am trying to explain here, is that the movement is simply a type of 'jump' between alternate universes (Multiverse theory). Of course we can not prove that is the case, as I said before, we understand how to manipulate the situation, but do not claim to prove M-theory as a physical law. It may be something else entirely, who knows. Further, when I mentioned "meshing", the intent was to help describe the effects upon the mind AFTER the experiment has concluded. It is a very strange sensation, to see things here, that existed there, yet still exist, combined with things which did not exist before. This phenomena has a distinct effect upon the mind of the test subject, and is currently considered the highest risk. Also, the fact that this phenomena exists at all, is suggestive of many of other questions, such as, is everything and all 'time' connected? There are many questions that remain unanswerable, yet our work will continue.