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.    Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

How Do Mail Carriers Get Their Routes?

Whether the topic is popcorn or particle physics, you can count on BrainStuff to explore -- and explain -- the everyday science in the world around us.

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The majority of humans become lactose intolerant as they grow up. Learn how ancient herders changed our digestive gene pool in this episode of BrainStuff, based on this article: https://health.howstuffworks.com/wellness/food-nutrition/facts/humans-built-drink-milk-adults.htm See omnystudio.com/listener for privacy information.

Are Humans Built to Drink Milk After Childhood?

https://auto.howstuffworks.com/car-driving-safety/auto-safety-testing/escape-sinking-car.htm; https://auto.howstuffworks.com/car-driving-safety/safety-regulatory-devices/auto-glass.htm See omnystudio.com/listener for privacy information.

How Should You Escape a Sinking Car?

Cherry blossom trees are so celebrated because their beautiful blooms are so short-lived. Learn about these trees (and how so many wound up in Washington, D.C.) in this episode of BrainStuff, based on this article: https://people.howstuffworks.com/culture-traditions/cultural-traditions/cherry-blossom.htm See omnystudio.com/listener for privacy information.

How Do Cherry Blossom Trees Work?

Starting in the 1930s, this adventurous Black woman toured the U.S., performed stunts, and served her country on motorcycles. Learn more in this episode of BrainStuff, based on this article: https://history.howstuffworks.com/historical-figures/bessie-stringfield.htm See omnystudio.com/listener for privacy information.

How Did Bessie Stringfield Shape Motorcycle History?

It turns out that some tree squirrels have complex organization systems for their stashes. Learn how they hide and find exactly what they want in this episode of BrainStuff, based on this article: https://animals.howstuffworks.com/mammals/squirrels-really-organize-nuts.htm See omnystudio.com/listener for privacy information.

How Do Mail Carriers Get Their Routes?

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