Quantum Physics 123: Monday 31 October

[ten-and-chips.livejournal.com]

[The Doctor's tie is orange today. If you could see them, his boxers are wee pumpkin print, but you can't, so there. He comes into class in his usual manner. That is to say, fairly manic.]

Right. In honour of the holiday, we're going to talk about everyone's favourite scary topic: paradox. Nasty stuff, that. In the purest of dictionary terms, paradox implies a contradiction in logic. The most famous of these are the words of Epimenides of Knossos on Crete: Cretans, always liars. If Epimenides is from Crete himself, then he must be lying. But if he is, then Cretans are not liars. And round we go.

The same concept is very true in regards to time travel. Encountering and touching oneself in the past, changing history so that you don't exist, either by events or technology...these cause paradox.

The effects of causing a paradox are varied in documentation...but they are all inherently destructive. [looks somber] Most notably to the time traveller him or herself. This is not to discourage any of you from travelling in time if you get the chance--far from it. It is merely a warning that to disturb certain things can create changes in timespace and in your own history.

[His eyes are sad...this is not exactly what he meant to do with this lecture.] Even if it's for the greater good.

[regaining composure] Any questions?

Comments

[carter-i-am.livejournal.com]

Sam grins at the Doctor like she's just won the lottery. He may or may not feel like a mouse at an owl preserve.

"Do you regret having done it? How do you know that the actions you took in undoing the paradox aren't going to make things worse for you now, in this reality?"

Of course, she doesn't tell him that she apparently once made the same choice and hasn't regretted it yet.

[ten-and-chips.livejournal.com]

[The Doctor's faced people with guns who were asking far less difficult questions. And the guns were pointed at him. Still, he isn't overly fazed, because Sam is asking the questions in good faith. The only problem is that he didn't want to make this class into a further rehashing of all his faults, which he'd gotten plenty of this weekend. So his expression isn't particularly warm.]

The first answer, Ms Carter, is personal, and depends on what day it is and which occasion we're referring to and how many students have decided to remind me of my shortcomings today. As for the second--one doesn't know. It becomes personal, a belief that... [He pauses and blinks a few times.] A belief that one is doing the right thing.

[carter-i-am.livejournal.com]

Sam, looking somewhat chastened, sits back a bit in her seat. "So, what you're telling me is that the answer to dealing with a paradox is...faith?"

[ten-and-chips.livejournal.com]

Hard to say that, from a scientist to another, isn't it? [He smiles, just a tiny bit.] Let's just say...perhaps.

[carter-i-am.livejournal.com]

The expression on Sam's face should say she's not happy with this answer. "Yes, sir."

The unasked question, then, is in what, exactly, the faith must be.

[ten-and-chips.livejournal.com]

[But she won't get any more on the subject. Unusual, from someone who loves to have the last word.]