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What if you put all 7 billion humans into one city, a city as dense as New York, with its towers and skyscrapers? How big would that 7 billion-sized city be? As big as New Jersey? Texas? Bigger? Are cities protecting wild spaces on the planet? We try a little experiment to find out.

Elected in 1956, Wisconsin state Sen. Fred Risser is the longest-serving state lawmaker in the country. He may not use Facebook, Twitter or email, but he's gotten a lot done over the years. Considered an "institution within an institution" by some, he was just re-elected for another four years.

Jack Lew is known as a smart, unassuming budget wonk who has spent most of his career in government policy-making jobs. Lew, President Obama's nominee to be Treasury secretary, is expected to face questions about his management years at Citigroup before the government bailed out the banking giant.

A young woman in Nigeria says God spoke to her in her dreams, guiding her to become a car mechanic. Despite initial resistance from her family, she fulfilled her vocation and has gone on to train other young women to do what one trainee calls "the best job in the world."

A group of top chefs, food scientists and tech geeks have set up a lab in Belgium to master 3-D food printing. Their goal: to create nutritionally enhanced foods that appeal to the pickiest palates.

Former Secret Service agent Jonathan Wackrow spent five years on President Obama's detail. He talks to NPR's Rachel Martin about the problems that have led to the agency's current scandals.

Swiss authorities have arrested several FIFA officials suspected of both receiving and paying bribes. David Greene talks to Matt Apuzzo, one of the reporters working the story for The New York Times.

Napa State Hospital in California added safeguards to protect workers after a psychiatric technician was murdered in 2010. But violence remains a part of daily life at the facility.

It's hard enough being homeless, but for women there are extra dangers and challenges. One D.C. woman who has lived on the streets for decades shares some of what she's learned.

How might a Brexit affect U.K. citizens in their everyday lives? Everything from mobile phone usage to Premier League football, pet travel and how much booze can be brought home duty-free may change.