The Second Law of Thermodynamics

The second law of thermodynamics tells us, "When two isolated systems in separate but nearby regions of space, each in thermodynamic equilibrium in itself, but not in equilibrium with each other at first, are at some time allowed to interact, breaking the isolation that separates the two systems, and they exchange matter or energy, they will eventually reach a mutual thermodynamic equilibrium. The sum of the entropies of the initial, isolated systems is less than or equal to the entropy of the final exchanging systems. In the process of reaching a new thermodynamic equilibrium, entropy has increased, or at least has not decreased." This is a pretty cool thing, because what it does is it allows to show that time travel is going to get really wonky fast. So let's say a boy receives a pocket watch from an old lady, eventually he develops a time machine and goes back in time. He meets a beautiful women and gives her the pocket watch. She outlives him and eventually gives said pocket watch to a nice little boy. So we have two points in time that are important here. Point A is the point in time where she gives the boy/man the pocket watch and  Point B is the point in time were he gives it to her. So the Watch must be the same at Point A and Point in B in all respects, the problem is that entropy which will always increase will be different at every point thus showing that it's impossible for this situation to exist. Also speaking of time travel, only two more days until the Christmas Special of Doctor Who. Also if you go to OSU or are in the surrounding area know there are attempts to bring Deadmau5 to OSU, which is pretty exciting. Tomorrow will be time for the Third Law of Thermodynamics so until then enjoy my favorite comic about the Second Law.