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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.

Physics Applications

         

How many stars are in the observable universe?

How many homo sapiens have ever lived?

How many water molecules are in a human head?

How long has the average United States citizen spent as president?

What percent of the observable universe has received radio transmissions from Earth?

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