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When Stanford professor Andrew Ng put one of his classes online, more than 100,000 students signed up. Now he's co-founded a company, Coursera, with the potential to give millions of students free access to classes from Stanford, Princeton, the University of Pennsylvania and other schools.

China's "Tianhe-2" (Milky Way 2) supercomputer took first place in one recent speed test, clocking in at 30 quadrillion calculations per second--about twice as fast as the best American machines. The U.S. still has more supercomputers than any other nation, but some experts say computer speed is a measure of a country's scientific innovation, and worry the U.S. is lagging behind.

NPR's Steve Inskeep asks author Barry Levine about the subpoenas issued by the Republican-led House for depositions from former top officials, including the Clintons, on the investigation into Jeffrey Epstein.

The investigation into the former CIA director's extramarital affair has now ensnared the top U.S. commander in Afghanistan. Investigators found thousands of communications between Gen. John Allen and a Tampa woman. He says they were not inappropriate. The sordid story is getting confusing.

A recent report by the research project found that one in three Americans raised in the middle class fall out of it as adults. Host Audie Cornish speaks with Erin Currier of the Pew Charitable Trusts' Economic Mobility Project about pressures on the American middle class.

One hundred years of the tax we all love to hate! Joe Thorndike of the Tax History Project talks to host Jacki Lyden about the history of the income tax in its centennial anniversary month.

As Peggy Olson on AMC's drama series, the actress has learned about her character's personality and development episode by episode, script by script, just like those of us who watch the show on TV. And she tells Fresh Air's Terry Gross that she prefers it that way.

Brad Stevens, coach of the Butler Bulldogs men's college basketball team, is headed for a bigger stage and bigger bucks in the NBA. NPR's Mike Pesca talks with Weekend Edition Sunday host Rachel Martin about why Stevens is a coach with indisputable, quantifiable worth.

Oreskes is a top Associated Press executive and former New York Times editor who has led newsrooms in such global centers as New York, Washington and Paris.

After Republicans unexpectedly picked up at least eight seats, House Democrats are still sorting out what went wrong. The party leadership must balance clashing priorities in the next term.