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How many stoplights are in your city? How many golf balls does it take to fill a plane? These seemingly un-answerable questions can be estimated surprisingly accurately using some clever techniques.

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Which value is the most reasonable estimate of the volume of air an adult breathes in one day?

**Hint:** Think about how much air a person will blow into a balloon with an average breath.

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Approximately how many movies are watched in homes in the United States in one year?

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It's your lucky day! You have been given $1,000,000 in $1 bills, but can only take the bills that will fit into your suitcase. In order to determine how much money you get to take home with you, you will probably need to estimate all of the following quantities EXCEPT:

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