I'm sure many of you are familiar with the "Pole-Barn" paradox. It demonstrates the concept (or lack of) simultaneity from two different inertial reference frames. (basically whether 2 events happen at the same time depends on the relative speed of the observer) My paradox concerns a heated pole that cools down. From Barn's reference frame (perspective): -As soon as the pole is fully inside the barn, both door's shut at the same time. -At this point in time, both ends of the pole are yellow-hot. -As soon as the front end of the pole reaches the back door, both doors open at the same time. -At this point in time both ends of the pole are red-hot. From Pole's reference frame: -Both doors do not shut and open at the same time. -Even though the pole can't fit into the barn, it passes through smoothly. And the most surprising of all: The pole is red-hot at one end and yellow-hot at the other!!! How can this be?! The Relativity Postulate: The laws of physics are the same in all inertial reference frames. So if the laws of physics are the same, how come from the Pole's perspective, it does not cool uniformly, but has different temperatures at both ends?