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Scientists are trying to figure out how chemicals in the air interact with each other to make people sick. So they're building an instrument — a "lung in a box" — that goes way beyond the usual chemical monitors.

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.

Mastectomies have become increasingly popular for women with breast cancer. That's a big turnaround from the 1980s, when women abandoned mastectomy in favor of breast-saving lumpectomy.

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.

The Mediterranean diet is one of the healthiest styles of eating in the world. But in many regions, including Denmark and Sweden, it's not easy to follow when olive oil is hard to find. Now Nordic researchers are exploring the health benefits of a Nordic diet, based on local foods like herring and bilberries.

Garland police officer Paul Clark is getting congratulations for pulling off an unusual "kitty rescue."“It’s one of those feel-good stories that a lot of…

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.

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.