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Rio de Janeiro is racing to ready itself for the 2016 Summer Olympics. But it's facing difficulties: ballooning budgets, pollution, questions about the development plans and rising crime. Some wonder whether ordinary Brazilians will benefit.

Federal authorities have arrested a Chinese national who is accused of trying to buy accelerometers from a company in suburban Seattle. Certain kinds of accelerometers are subject to export controls, because they're used to guide missiles and spacecraft. The U.S. has been trying to keep accelerometer technology under wraps for half a century. Even as some accelerometers were used to guide Cold War missiles into space and around the world, today's technological descendents allow you to play racing games on your iPhone.

The city has a lot of abandoned buildings, and to decide which ones should be demolished, the federal government and some major foundations started a massive, high-tech mapping project. The new mayor says that's just what he needs to improve the neighborhoods.

Carriage drivers say many of their horses have been rescued from abusive situations; animal rights activists argue that the rides are inherently inhumane. Now, New York City Mayor Bill de Blasio wants to replace the horses — with vintage electric cars.

Many students who don't ace the SAT and ACT tests apply to schools that make standardized test scores optional. A new study shows those students do just as well in college as those who submit their scores.

A United Nations panel accuses the North Korean regime of rape, forced abortions, intentional starvation and slavery. David Greene talks to retired Australian judge Michael Kirby, chairman of the U.N. Commission of Inquiry on Human Rights in North Korea.

A copy of Monster-In-Law, rented in 2005, is at the center of a story that landed a South Carolina woman in jail for a night. Kayla Michelle Finley, 27, ended up spending a night at the county jail before posting a $2,000 personal recognizance bond and being released.

The head of a clown organization told the New York Daily News that clowns "just aren't cool anymore." Rubber noses and rainbow wigs just can't compete for young talent with tech startups and Wall Street.

The activists say they have been taken into custody each of the past three days, then later released. They want to perform a protest song in Sochi. They were convicted of "hooliganism" for performing a "punk prayer" in Moscow in 2012. Just before the games began, the women were freed from prison.

The new host's first show is getting good reviews. He pledged to "do the best I can" and collected on some "bets" from friends such as Robert De Niro, Lady Gaga and Stephen Colbert who had supposedly bet he'd never take over from Jay Leno.