All the while, Adri has been looking over your shoulder, and gazing with interest at the diagrams on the walls.
"Wow," she says. "Mars - the Angry Red Planet. Let me see if I got this right. This guy Foster is sealed in this pod thing, right? With a bunch of plants that make oxygen for him to breathe."
"They convert the carbon dioxide he breathes out into oxygen he breathes in," you say.
"Right. But something's gone wrong. There's not enough oxygen, and too much carbon dioxide. So he's going to pass out soon."
"Except that the emergency hatch will pop open first," you say. "And shut down our experiment."
"Probably cost a lot to start it up again."
"About half a million dollars."
"Oh." Her eyes flick over to the pizza box. "I guess this would be a bad time to remind you that you owe me $16.25 plus tax and, uh, tip."