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Oral bacteria may be determined by environment, not genes, scientists say. That's different from other parts in the body, like the gut, where bacteria may be influenced by genome or immune system.

Jae Su Chun says he did not verbally or physically abuse his skaters. He also denies telling one athlete to damage a competitor's skates. But he does apologize for not reporting the incident.

In October 1962, Nick Holonyak and colleagues at General Electric built the first practical light-emitting diode, or LED, that could emit visible light. Semiconductor LEDs are now a part of uncountable electronic devices. Holonyak discusses the invention, and his work since then.

The first two debates of the 2012 election cycle have had stratospheric viewership on TV.

The musician and educator spent six years as Ira Gershwin's cataloger and archivist. His experience forms the basis of a new book, The Gershwins and Me, in which he explores George and Ira's work and influence.

The Iron Curtain fell more than two decades ago, but one capital in Europe remains divided: Nicosia, in the tiny island-nation of Cyprus. A 1974 war between Cyprus and neighboring Turkey left the two ethnic populations on the island — Greek and Turkish Cypriots — separated and embittered.

Punahou School occupies a privileged position in Hawaiian society. Barack Obama attended the school on a scholarship starting in the fifth grade. Punahou's lasting gift to Obama was that the elite environment familiarized him with success.

One day after the only vice presidential debate, Rep. Paul Ryan and Vice President Joe Biden took to the campaign trail. NPR's Ari Shapiro reports.

Weekend Edition host Scott Simon talks with NPR's Peter Kenyon and NPR's Kelly McEvers about the latest news in Turkey and Syria, where fighting from Syria's internal conflict has spilled across the border the two nations share.

The crowds that cheered the shuttle on Saturday changed their tune after a night of hassles that left the Endeavour still blocking L.A. traffic and threatening trees early Sunday morning.