Delivering mail to all 372 million Americans along all 214,000 postal routes is no easy task. Learn how the U.S. Postal Service designs those routes in this episode of BrainStuff.
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What Do A.M., P.M., and SOS Stand For?
09:18

How Do Fainting Goats Work?
09:04

Does Smog Make Sunsets More Beautiful?
08:23