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Most economic textbooks will tell you that there can be real dangers in running up a big national debt. A major concern is how the debt you add now could slow down economic growth in the future. Economists have not been able to nail down how much debt a country can safely take on. But they have tried.

Back in 2010, two economists took a look at 20 countries over the course of decades, and sometimes centuries, and came back with a number. Their analysis suggested that economic growth slowed significantly once national debt passed 90% of annual GDP... and that is when the fight over debt and growth really took off.

On today's episode: a deep dive on what we know, and what we don't know, about when exactly national debt becomes a problem. We will also try to figure out how worried we should be about the United States' current debt total of 26 trillion dollars.

This episode was hosted by Keith Romer and Nick Fountain. It was produced by Willa Rubin and edited by Molly Messick. It was fact-checked by Sierra Juarez with help from Sofia Shchukina and engineered by Cena Loffredo. Alex Goldmark is Planet Money's executive producer.

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For thousands of years, getting light was a huge hassle. You had to make candles from scratch. This is not as romantic as it sounds. You had to get a cow, raise the cow, feed the cow, kill the cow, get the fat out of the cow, cook the fat, dip wicks into the fat. All that--for not very much light. Now, if we want to light a whole room, we just flip a switch.

The history of light explains why the world today is the way it is. It explains why we aren't all subsistence farmers, and why we can afford to have artists and massage therapists and plumbers. (And, yes, people who make podcasts about the history of light.) The history of light is the history of economic growth--of things getting faster, cheaper, and more efficient.

On today's show: How we got from dim little candles made out of cow fat, to as much light as we want at the flick of a switch.

Today's show was hosted by Jacob Goldstein and David Kestenbaum. It was originally produced by Caitlin Kenney and Damiano Marchetti. Today's rerun was produced by James Sneed, and edited by Jenny Lawton. It was fact-checked by Sierra Juarez. Engineering by Valentina Rodríguez Sánchez. Alex Goldmark is Planet Money's executive producer.

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The Indicator has had a busy year — rebranding the podcast, coming up with a new mascot, and now creating merch. In today's bonus episode, we get a brief oral history of early merch and Indicator hosts Adrian Ma, Darian Woods and Wailin Wong reveal the winning name of the show's mascot. Best of all, we share how Planet Money+ supporters can score some exclusive new merch: a tote, mug, hat, and plushie! Just listen to find out more. FYI: The next PM+ bonus episode will be out on Monday, 6/17.Show your support for Planet Money and the reporting we do by subscribing to Planet Money+ in Apple Podcasts or at plus.npr.org. You'll be able to unlock this episode and other great bonus content. Regular episodes remain free to listen! Email the show at planetmoney@npr.org.

There is a constant arms race between law enforcement and criminals, especially when it comes to technology. For years, law enforcement has been frustrated with encrypted messaging apps, like Signal and Telegram. And law enforcement has been even more frustrated by encrypted phones, specifically designed to thwart authorities from snooping.

But in 2018, in a story that seems like it's straight out of a spy novel, the FBI was approached with an offer: Would they like to get into the encrypted cell phone business? What if they could convince criminals to use their phones to plan and document their crimes — all while the FBI was secretly watching? It could be an unprecedented peek into the criminal underground.

To pull off this massive sting operation, the FBI needed to design a cell phone that criminals wanted to use and adopt. Their mission: to make a tech platform for the criminal underworld. And in many ways, the FBI's journey was filled with all the hallmarks of many Silicon Valley start-ups.

On this show, we talk with journalist Joseph Cox, who wrote a new book about the FBI's cell phone business, called Dark Wire. And we hear from the federal prosecutor who became an unlikely tech company founder. Help support Planet Money and hear our bonus episodes by subscribing to Planet Money+ in Apple Podcasts or at plus.npr.org/planetmoney.

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We are living in a kind of golden age for online fraudsters. As the number of apps and services for storing and sending money has exploded – so too have the schemes that bad actors have cooked up to steal that money. Every year, we hear more and more stories of financial heartbreak. What you don't often hear about is what happens after the scam?

On today's show, we follow one woman who was scammed out of over $800,000 on her quest to get her money back. That journey takes her from the halls of the FBI to the fraud departments of some of the country's biggest financial institutions. And it offers a window into how the systems that are theoretically designed to help the victims of financial cybercrime actually work in practice.

This episode was hosted by Alexi Horowitz-Ghazi and Jeff Guo. It was produced by Willa Rubin and edited by Keith Romer. It was engineered by Neal Rauch and fact-checked by Sierra Juarez. Alex Goldmark is Planet Money's executive producer.

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For a long time, some politicians have sold lower taxes, fewer regulations, and smaller government as integral to enhancing freedom. Nobel-prize-winning economist Joseph Stiglitz, in a new book, opposes that view and argues it's paved the way to a dangerous political era. In this bonus episode, Stiglitz shares his vision of "freedom" and of government playing a more active role in the economy. It's another edition of Behind The Newsletter, where Greg Rosalsky shares his interviews with policy makers and economists who appear in the Planet Money newsletter.You can sign up for the The Planet Money Newsletter and check out past editions here:https://www.npr.org/planetmoneynewsletterShow your support for Planet Money and the reporting we do by subscribing to Planet Money+ in Apple Podcasts or at plus.npr.org. You'll be able to unlock this episode and other great bonus content. Regular episodes remain free to listen!Email the show at planetmoney@npr.org.