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# Fermi Estimation

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.

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.

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

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