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David Kestenbaum

The Internet Archive and the University of Maryland launch such a library, and it's free to anyone with an Internet connection. Kids helped design the library, and they had final say on the books. NPR's David Kestenbaum reports.

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Each summer, as college students prepare to leave campus, they get rid of their textbooks, selling them for cheap. And Bob Peterson and Kenny Jacobson are waiting to buy them, and resell them when school is back in session and demand is high. Their scheme sounds simple, and it is. They've noticed a difference in price, and they're turning it into a quick profit.

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Note: This episode originally ran in 2015.

Spreadsheets used to be actual sheets of paper. Sometimes, a bunch of sheets of paper taped together.

Any calculation made on a spreadsheet was done by hand, and these could take days to complete for an accountant or bookkeeper. It was tedious. One little adjustment to these calculations meant a whole day of erasing and filling the same boxes out again.

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Now we have the story of information you get from your doctor as well as information you do not.

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The online furniture company Wayfair is now one of the most shorted stocks. Our Planet Money team talks to its CEO about what it's like to be running a company when some investors are betting on your fall.

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On January 1, 20 states raise their minimum wage and several states have additional increases planned in the coming months. Yesterday, we learned that Walmart will raise its base pay to $9 an hour this April.

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A lot of people buy stocks, hoping they will go up in value. But it is possible to bet in the opposite direction. You can bet against a stock, hoping it will plunge. It's called "shorting" a stock.

Most people don't short stocks, and we wondered why. So we decided to short something ourselves.

We had no idea what to short, or how to do it. So we asked the well-known short seller Andrew Left of Citron Research for advice. He interrupted me before I could finish explaining our plan.

"Don't do it," he said.

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