oh. I was hoping it'd explain time-travel, which concept I have a small problem with: if at point X in time, someone takes a time travel machine and goes back to the past, say Y in time, and interacts with the persons and surroundings there and then, wouldn't that very interaction change the future such that the someone is no longer able to go back to the past? If one is able to zoom in and out of time, there must be a caveat that they do nothing to change whatever is happening at that precise moment?

hmm.. am I making sense?