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The note from the Republican vice presidential nominee's doctor comes after a week of intense discussion about the health of Hillary Clinton and Donald Trump.

The ride-hailing firm Uber began testing driverless cars in Pittsburgh this week. Professor and author Timothy Carone discusses the technology and risks of driverless Uber vehicles.

Does the media have a responsibility to consider the agenda of sources — especially foreign governments — when it's airing hot news that comes from hackers?

Most of Russia's opposition has been greatly weakened or eliminated. As Russians elect a new parliament, it's expected to be a rubber-stamp body that follows the wishes of President Vladimir Putin.

The Oscar-winner got raves for the outfit she wore this past week. The gown was by Carolina Herrera. And the head tie? Pure Nigeria.

NPR's series, A Nation Engaged, takes a deeper look at economic opportunity in 21st century America. Is the middle class still shrinking, and what can political leaders do to help?

Drug czar Pablo Escobar's son studied to be an architect. But his late father's notoriety interfered with business, so today he's a speaker urging kids to stay away from drugs.

The NFL announced last week it will invest $100 million to advance concussion research. Rachel Martin asks David Camarillo, who leads a Stanford University lab dedicated to inventing such equipment

Some of Donald Trump's digs have sounded suspiciously like criticisms Hillary Clinton has leveled against him.

The suspect was reportedly wearing a private security uniform and made at least one reference to Allah, authorities say. They add that the motive for the mass stabbing remains unclear.