Sally Helm

This is Planet Money from NPR.

This is Planet Money from NPR.

This is Planet Money from NPR.

Okay. Three. Two.

Okay. Three. Two.

Okay. Three. Two.

My ears just popped.

My ears just popped.

My ears just popped.

It took exactly three minutes and 40 seconds.

It took exactly three minutes and 40 seconds.

It took exactly three minutes and 40 seconds.

As people went into military service during the war, they had all that knowledge built up about the route that they worked every day. They knew how many stairs they were going to have to climb. They knew how many mailboxes were on that street. They knew the farm next door and how you sort the mail to prepare yourself.

As people went into military service during the war, they had all that knowledge built up about the route that they worked every day. They knew how many stairs they were going to have to climb. They knew how many mailboxes were on that street. They knew the farm next door and how you sort the mail to prepare yourself.

As people went into military service during the war, they had all that knowledge built up about the route that they worked every day. They knew how many stairs they were going to have to climb. They knew how many mailboxes were on that street. They knew the farm next door and how you sort the mail to prepare yourself.

You might have a street with the same kind of sounding name where it's Oak Street or Oak Branch Place or something like that. And so if somebody forgot to put the number on there, it helps you be able to sort that faster and figure out, oh, Margaret lives in the neighborhood with zone number 10. Problem solved. For now.

You might have a street with the same kind of sounding name where it's Oak Street or Oak Branch Place or something like that. And so if somebody forgot to put the number on there, it helps you be able to sort that faster and figure out, oh, Margaret lives in the neighborhood with zone number 10. Problem solved. For now.

You might have a street with the same kind of sounding name where it's Oak Street or Oak Branch Place or something like that. And so if somebody forgot to put the number on there, it helps you be able to sort that faster and figure out, oh, Margaret lives in the neighborhood with zone number 10. Problem solved. For now.

And everything that goes hand in hand in generating. People sending in postcards to renew subscriptions and, well, and things like bills. As the economy grows, the bills keep coming in as well.

And everything that goes hand in hand in generating. People sending in postcards to renew subscriptions and, well, and things like bills. As the economy grows, the bills keep coming in as well.