What do you think

N: How many buildings are there in the whole world?

J: I don't know.

N: How many do you think?

J: Do barns count as buildings?

N: What's a barn?

J: A home for farm animals.

N: No, just homes for people. Including sky scrapers.

J: Does our house count as 1 or 2 (it's a duplex)

N: two

J: so you really want to know about the number of homes.

N: yes, how many?

J: 2 billion

N: really? Do you know?

J: it's just a guess

N: I think 4 billion.

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