What are the speakers talking about?

M: I have a question. I’m never quite sure where to sit during a business meeting.
W: The ancient Chinese art " Feng Shui" teaches that you should never sit with the door behind you—and actually there’s a scientific reason for that. When a person’s back is placed towards an open space he becomes stressed: his blood pressure increases and his heart beats faster.
M: That makes sense! People subconsciously worry about getting attacked if they don’t know what’s going on behind them.

W: Let’s get some organic vegetables. My sister Amy says they really do taste better.
M: Maybe, but they’re also more expensive. I was talking to Jason at work about this. I mean, yeah, he buys organic food, but his salary is also much higher than mine.
W: OK, let’s do this. We’ll get some organic tomatoes, just to give them a try. Then we’ll see how we like them and go from there.