What is the main topic of the conversation?

M: It looks like we are going to have a shower at any minute now.
W: I think so too. Isn’ t it strange how you cart sense it.
M: I know what you mean.
W: Look at the clouds in the sky. Whenever they seem dark and law like this, you know it’ s going to rain. Or look at an object that’ s far away. If it seems clear to you, it probably going to pour.
M: Yes, and every thing seems to have a stronger smell to me then.
W: I know, and people often say it’ s going to rain when they have aches and pains in certain parts of their body.
M: mother always complains that her knee hurts just before a storm.
M: And have you ever noticed how the animals act before a storm?
W: Sure. Horses and cows always seem to go to a protective area and huddle together.
M: Yeah, but with always the sensible things, how come we aren’t carrying an umbrella with us now.