David Kestenbaum

David Kestenbaum is a correspondent for NPR, covering science, energy issues and, most recently, the global economy for NPR's multimedia project Planet Money. David has been a science correspondent for NPR since 1999. He came to journalism the usual way — by getting a Ph.D. in physics first.

In his years at NPR, David has covered science's discoveries and its darker side, including the Northeast blackout, the anthrax attacks and the collapse of the New Orleans levees. He has also reported on energy issues, particularly nuclear and climate change.

David has won awards from the American Association for the Advancement of Science, the American Physical Society and the Institute of Electrical and Electronics Engineers.

David worked briefly on the show This American Life, and set up a radio journalism program in Cambodia on a Fulbright fellowship. He also teaches a journalism class at Johns Hopkins University.

David holds a bachelor's of science degree in physics from Yale University and a doctorate in physics from Harvard University.

Planet Money
8:40 am
Fri July 11, 2014

When Ikea Raises Its Minimum Wage, Where Does The Money Come From?

Flickr user: dahlstroms

Originally published on Fri July 11, 2014 12:04 pm

Ikea, a company famous for keeping its costs down, recently announced that it would raise the average minimum wage for its retail workers to $10.76 an hour. Why would the company volunteer to pay its workers more?

"By taking better care of our coworkers," says Rob Olson, the acting president of Ikea U.S., "they will take better care of our customers, who will take better care of Ikea. We see it as a win-win-win opportunity."

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Planet Money
1:59 pm
Fri May 16, 2014

Is A Stradivarius Just A Violin?

A Stradivarius violin at the restoration and research laboratory of the Musee de la Musique, Paris, in 2009.
Patrick Kovarik AFP/Getty Images

Originally published on Fri May 16, 2014 5:00 pm

The Stradivarius violin gets its name from master craftsman Antonio Stradivari. When he died in 1737, his secrets died with him: No one has ever been able to duplicate the sound of the violins or violas he made.

His instruments have taken on a mythical quality. Today they fetch millions of dollars at auctions; Sotheby's will soon auction off a viola that it expects to sell for $45 million.

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Planet Money
2:41 pm
Fri March 21, 2014

'The Numbers Are Getting Better, The People Are Getting Worse'

Elias Tilligadas and Katerina Margeritou have both had their salaries cut by the Greek government.
Nikolia Apostolou NPR

Originally published on Thu March 27, 2014 6:39 am

When we talked to Katerina Margaritou two years ago, she was worried about how she would pay for her wedding dress. She was working for the government as a chemist, but hadn't received a paycheck in months.

Katerina was starting to lose faith in her country, starting to think she and her fiancee, Elias Tilligadas, would be better off leaving Greece.

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Planet Money
5:29 pm
Thu March 6, 2014

Does Raising The Minimum Wage Kill Jobs?

Kenzo Tribouillard AFP/Getty Images

Originally published on Thu March 6, 2014 4:50 pm

President Obama has called for increasing the minimum wage, saying it will help some of the poorest Americans. Opponents argue that a higher minimum wage will lead employers to cut jobs.

Figuring out the effect of raising the minimum wage is tough. Ideally you'd like to compare one universe where the minimum was raised against an alternate universe where it remained fixed.

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Planet Money
4:38 pm
Wed February 5, 2014

A Venture Capitalist Is Betting A Pair Of Socks (And $50 Million) On Bitcoin's Future

Marc van der Chijs Flickr

Originally published on Fri February 7, 2014 8:26 am

Ben Horowitz is a big-time venture capitalist. His firm invested in Facebook and Twitter. More recently, his firm invested some $50 million in startups related to bitcoin, the virtual currency that works like online cash. Ben thinks bitcoin is going to change the way people buy and sell stuff on the Internet.

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Planet Money
11:47 am
Wed December 11, 2013

We Found This 20-Year-Old T-Shirt In Kenya. The Internet Found The Original Owner

Tshirt
Quoctrung Bui

Originally published on Wed December 11, 2013 9:46 pm

We recently published a story about how used clothes that get donated in the U.S. often wind up for sale in markets in Africa. As part of the story, we published some photos of used T-shirts we found in a couple of markets in Kenya.

One shirt in particular caught our eye:

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Planet Money
12:46 am
Thu October 10, 2013

What A U.S. Default Would Mean For Pensions, China And Social Security

iStockphoto.com

Originally published on Thu October 10, 2013 9:38 am

What would happen if Congress doesn't raise the debt ceiling and the U.S. defaults on its debt later this month? The broad economic implications are unpredictable, but a default could cause huge trouble for the global economy.

But whatever happens to the global economy, one thing is clear: People all over the world who have loaned the U.S. government money won't get paid on time.

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NPR Economy
4:15 pm
Thu October 4, 2012

The Accountant Who Changed The World

Summa de Arithmetica, Geometria, Proportioni et Proportionalita." href="/post/accountant-who-changed-world" class="noexit lightbox">
A page from Pacioli's math encyclopedia, Summa de Arithmetica, Geometria, Proportioni et Proportionalita.
via Jane Gleeson-White

Originally published on Fri October 5, 2012 1:04 pm

The story of the birth of accounting begins with numbers. In the 1400s, much of Europe was still using Roman numerals, and finding it really hard to easily add or subtract. (Try adding MCVI to XCIV.)

But fortunately, Arabic numerals (1, 2, 3, 4, etc.) started catching on, and with those numbers, merchants in Venice developed a revolutionary system we now call "double-entry" bookkeeping. This is how it works:

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