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Microsoft, the company that defined the PC, is still enormously profitable — but not as profitable as it once was.

This week, Microsoft will try to regroup. It is rolling out the largest upgrade of its Windows software in more than a decade. All of this is meant to help the company break into the exploding market for mobile.

While the company still commands a formidable computing empire, it is now under attack.

Microsoft's CEO is Steve Ballmer, a big, bombastic, balding guy. These days he's riled up about Windows 8.

In what may come as a pleasant surprise to people who fear the Facebook generation has given up on reading — or, at least, reading anything longer than 140 characters — a new report from the Pew Research Center's Internet and American Life Project reveals the prominent role of books, libraries and technology in the lives of young readers, ages 16 to 29. Kathryn Zickuhr, the study's main author, joins NPR's David Greene to discuss the results.

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Lance Armstrong became a bicycle racing legend when he won every Tour de France from 1999 to 2005. But after what happened today, there will be no official record of all those victories. Cycling's international governing body announced it will not appeal sanctions by the U.S. Anti-Doping Agency.

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Diet soda. We love it or hate it. But there's no doubt that consumption is on the rise. More Americans than ever are drinking diet colas, along with other zero- and low-calorie alternatives.

While diet drink consumption is up across the entire population — about 1 in 5 of us consume them — it's higher-income, middle-aged women who are most likely to be sipping diet drinks, according to a recent Centers for Disease Control and Prevention survey.

Iran is hurting. Economic and banking sanctions, plus an effective oil embargo led by the European Union, have brought chaos to Iran's economy. The bottom fell out of its currency, the rial, a couple of weeks ago, provoking street protests. Iranians of all social classes are struggling to cope.