Even a quick snap can cause a massive, dangerous runner pile-up, organizers say.
Only 40 percent of young minorities in low-income New York City neighborhoods say they would feel comfortable calling 911 if they needed help.
A knee-high morass of mud did not deter this Boulder man from enjoying his morning jog.
It's going up like crazy, but people keep buying.
After Hurricane Sandy, tight neighborhoods and centralized infrastructure recovered more quickly than spread-out areas.
Burkina Faso has one of the lowest literacy rates in the world. Here's how vendors draw people into their architecturally repetitive kiosks.
With two of the library's six employees gone over a dumb controversy, it's hard to find much of a winner in this story.
Researchers have found evidence that strong social ties may be just as important as not smoking.
People are planting more trees, thinking carefully about coastal development, and anticipating the future of California's wineries.
Raleigh regularly tops "Best City" lists. Mayor Nancy McFarlane explains why that can be a challenge.
On M Street, the city has compromised rider safety, placed private interests above public, and let parking rule the day.
A new NASA map of the planet lays out the depressing geographies of smog and premature death.
Researchers are studying its earwax to learn about human-made ocean pollution. Yes, there are photos.
It's the latest Northern European city to see pro- and anti-marijuana forces face off.
Five percent of vehicles are responsible for 90 percent of toxic emissions. Now we can figure out who the culprits are.
He's required to wear a bow tie, and gets paid in food.
It offers up strange collection of "urban amenities," including shopping malls, and "futuristic" buildings.
1 in 9 American prisoners has been sentenced to die in jail.
A new report ranks 34 major U.S. cities by their energy-use policies.