Time travel is a difficult subject. It also happens to be a very popular subject of many stories in books, television, movies, video games, and so on. But human kind's limited understanding of the workings of time and the possibility of time travel (especially the limited understanding of the casual book reader, movie viewer, or video game player) leads to depictions of this subject being wrought with logical inconsistencies, paradoxes, and plot holes.
One of the most common problems with time travel stories is the creation of paradoxes. Of these, some of the most common paradoxes are the "predestination paradox", the "bootstrap paradox", and the "grandfather paradox" (or the "reverse grandfather" paradox). You're probably familiar with all of these, but you may not know them by name, so I'll take a moment to define them for you:
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