As promising as some theories may seem, there are still many problems with the concept of time travel. If humans ever were able to travel time, there would be many dire consequences to consider before even attempting to change our own timelines. Paradoxes occur when events happen that shouldn't actually be possible, for instance if a time traveler were to meet up with their former self to tell themselves to, in the future, go back in time and tell their former selves to time travel. So, if we're saying past self is self A and future self is self B, and self B goes back in time to self A, to tell self A that self B should time travel back in time, because self B has the memory, how does self B know to travel back in time? Because self A has the memory and becomes self B, or because self B told self A? Loops like these are the kinds of problems one comes up against in looking at the theories of time travel. We will be studying the ontological paradox, the predestination paradox, and the grandfather paradox specifically.