This is Planet Money from NPR.

Maybe it's a good time to give a little behind the scenes tour of the Planet Money idea

factory.

Some days, everything is easy.

We're in the middle of a story where following our curiosities, chasing after answers, writing

or editing, living, laughing, loving.

But inevitably, that story gets published.

In the day after that, we get like a curiosity hangover.

We start thinking, will I ever find a great story again?

It is in moments like these that we pour ourselves a cup of coffee, get a greasy breakfast sandwich,

and pop open the Planet Money inbox.

Because dear listeners, you are a curious bunch.

You always have questions.

And today, we're answering some of them.

It's the Planet Money listener question show.

We're back with our first listener question answerer, Dave Blanchard.

Dave, hello.

Hi Nick Fountain.

Alright Dave, your question comes from Gary of Bainbridge Island, Washington.

And it's about fish.

He writes,

My wife recently purchased a few goldfish for her fourth grade classroom.

...