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New technology is changing the way cities are run, with cutting-edge urban innovations around the globe. Sprawling, chaotic Rio de Janeiro has built a state-of-the-art operations center as it gears up for two major events.

A young woman's question prompted an eloquent answer from the actor, who spoke of the abuse his mother suffered and the role men must play in stopping such cruelty. "Violence is never, ever a choice that a man should make," said Stewart.

Federal authorities believe the Spokane man accused of sending a ricin-laced letter to a federal judge may have also sent similar poisoned letters to the

Nuon Chea, the No. 2 leader in the genocidal Cambodian regime, and head of state Khieu Samphan are on trial for genocide and crimes against humanity during the 1970s.

Some Democrats might snicker at Mitt Romney's desire to be involved in the 2014 midterm election campaigns. While there are limits to his usefulness as a campaigner, he could have an upside for Republicans as a fundraiser.

When Arvind Mahankali won the Scripps-Howard National Spelling Bee last night, he became the sixth consecutive Indian-American winner and the 11th in the past 15 years.

With the bass, "you have a lot more power than you may think," Oh says in a session with Jon Weber.

Scientists in Siberia say they've extracted blood samples from the carcass of a 10,000-year-old woolly mammoth, leading to speculation that a clone of the extinct animal might someday walk the earth. But researchers say the find must be studied further to know its potential.

President Obama is using his bully pulpit to push for his plan to keep student loan interest rates from doubling. At a White House Rose Garden event, Obama urged students and parents to lean on their congressional representatives.

The Bureau of Economic Analysis released monthly data on the personal finances of Americans Friday. It shows Americans' income, spending and savings pretty much unchanged from last month. Planet Money's Adam Davidson explains to Melissa Block what this tells us about the state of the economy.