I have just starting getting into this stuff over the last few years and I recently read an article about the newest theory on the creation of our universe. If our Universe was created by the colliding of two branes in another dimension and eventually once all the energy in our Universe has dissipated, what happens to this energy before the next expansion? Is the theory not that energy can not be created or destroyed, it merely exists? If the Universe is in an infinite cycle of expansion and collapse then surely there are an infinite amount of chances that in another expansion and creation that we will all live the same life and existence again, albeit trillions and trillions of years from now? I am also wondering if this could account for deja Vu? Taking into account the theory on entanglement of sub atomic particles and how they remember this entanglement could there be a link in all of the above?