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Medical experts have long thought that gum disease can cause heart disease. But now they say no; it's other health issues like smoking and lack of exercise that are causing both. But this doesn't mean you can stop flossing.

The Federal Reserve and other banking regulators have granted banks a two-year grace period to come into compliance with the Volcker Rule. That's one of the provisions of the Dodd-Frank financial overhaul bill passed nearly two years ago. It restricts U.S. banks from making trades that put the bank and depositor funds at risk. But regulators are struggling to iron out the details of those rules.

More than 6,000 original stories were submitted to this round of Three-Minute Fiction. Host Guy Raz presents this week's stand-out stories: Rid Yourself of this Pest Today! by Elizabeth "Bitsy" Hawes Unangst and Just In Case by Robin McCarthy.

Three years ago, a Chicago man found historic documents in an abandoned house and took them to a rare-books dealer. The papers and books belonged to Richard T. Greener, a 19th century intellectual, who was the first African-American to graduate from Harvard University.

The focus of the trial is Adis Medunjanin and the role he allegedly played in a 2009 plot to bomb New York City subways. But the trial itself is a milestone: It's the first time the people dispatched to carry out al-Qaida plots are being heard in open court. One terrorism expert called it a "convention of terrorism suspects."

There are big questions about Mitt Romney's ability to appeal to Latinos. Hispanic voters favor President Obama over Romney by more than two to one, according to a recent Pew poll. But not everyone is sure the president's lead will translate to votes. Host Michel Martin speaks with columnist Ruben Navarrette and Maria Teresa Kumar of Voto Latino.

The prospect of losing may well discourage Iran from launching a direct cyberattack on the United States. But having a cyber arsenal for deterrent purposes would not necessarily preclude Iran from sharing those weapons with groups less hesitant to use them, security experts say.

African traders have congregated around the southern Chinese city of Guangzhou in recent years. For one trader, success came quickly — but it was followed by a rude awakening as he negotiated his deals.

The beating of Rodney King by Los Angeles police officers sparked the chain of events that led to the deadly L.A. riots 20 years ago this weekend. Host Michel Martin speaks with Rodney King about his memories of the riots, the beating, and his new book, The Riot Within: My Journey from Rebellion to Redemption.

The Los Angeles riots stunned the nation in 1992, claiming more than 50 lives in that city. As the unrest approached Koreatown, store owner Kee Whan Ha mobilized his fellow business owners to arm themselves and defend their property. Host Michel Martin talks with him about the riots, and the neighborhood today.