Last week, we took a look at 120 years of history. This week, we examine the question: What if you could actually travel back to any of those points in time? In honor of the #timelessmovie, premiering on NBC this week, we analyze the sci-fi concept of time travel. Get ready to nerd out on the three primary models of time travel used in fiction, the problems, complications, ethical dilemmas, and paradoxes that could result from these models, the scientific basis of time travel, advancements in physics and the possibilities of time travel becoming a reality, and our favorite time travel books and movies!