679: Christmas Plans
Title text: Physicists who want to protect traditional Christmas realize that the only way to keep from changing Christmas is not to observe it.
This comic centers around a joke about Heisenberg's uncertainty principle in physics, which states that you can know where a particle is, and you can know its momentum, but you can't know both simultaneously. The title text further reinforces this joke.
- [Character A is standing behind Character B, who is sitting at a computer.]
- Character A: Hey, will you be in town the day after Christmas?
- Character B: Couldn't say—
- Character B: I'm Jewish.
- Character A: But... how does being Jewish keep you from knowing your plans?
- Character B: I know my plans—
- Character B: I just don't know when Christmas is.
- Character A: Really? Why not look it up?
- Character B: Well, I'm also a physicist.
- Character A: So?
- Character B: I believe that since I don't observe Christmas, it can't have a definite date.