Hugh: So, listen to this. This is what he's written. "There is another theory: that two states continue to exist... separate and decoherent from each other, each creating a new branch of reality... based on the two outcomes. Quantum decoherence ensures that the different outcomes... have no interaction with each other."
Mike: No, we're not splitting up. We're just gonna go in two different groups.
Mike: This whole night we've been worrying... there's some dark version of us out there somewhere. What if we're the dark version?
Kevin: [his phone ringing] That's weird. It's you calling me. Hello?
Hugh: These are Brian's notes from his lesson plan for his class. "Decoherence and Schroedinger's Cat."
Mike: Let's have a drink.
Kevin: [on the phone] I felt like I had a lot of time.
Em: I know. It's good. I'm good.
Kevin: Yeah. We're, um... we're just getting off the freeway.
Em: Yeah? Did, Hugh pick you up at the office, or...
Kevin: Yes, he was coming in from Oakland. He was late, of course. Then I took him... And then, he took me to some lawyer bar.
Em: A lawyer bar?
Kevin: Yeah. A lawyer bar, kind of. Yeah. I don't know. Everybody there seemed like a lawyer. I felt like I was the only person without a tie.
Em: Well, maybe we should get you a tie for emergencies.
Kevin: Yeah, wardrobe emergencies.
Laurie: Em, you seem to be the comet expert here. What happened the last time?
Em: This one passed over a hundred years ago, but much farther.
Laurie: But do we know about anything that happened?
Em: Nothing happened then, it was too far away.
Laurie: So, is there any reason we should be freaked out right now?
Em: Well, I mean, it is a lot closer this time.
Laurie: What does that mean?
Em: Okay. I read one more thing...
Lee: Oh, another story!
Em: Just one more. It's called the Tunguska Event, and, um, it was a comet or a meteor or something like that, that entered the atmosphere over Siberia and exploded over Earth. So it didn't actually have physical impact. It didn't touch Earth, it didn't leave a crater or anything, but the force of that explosion flattened trees for hundreds of miles. But it only killed about one to two people.
Laurie: It's Siberia. There were probably only two people there.
Em: Yeah, but they don't necessarily...
Mike: [jokingly] It wiped out the population of Siberia.
Laurie: Basically, yeah.
Laurie: Well, that doesn't make me feel better.
Kevin: And when was this?
Em: It was like, in 1908, 1903...
[Suddenly they hear someone banging on the door and get startled]