Planning and construction all over the country will need to shift dramatically as the retired population grows.
What other factors influence which states have the highest teen birthrates?
Is one of Spain's most famous traditions fading away?
America's metro areas generate 80 percent of the country's GDP. But so far, that economic reality has not generated a proportional amount of political clout.
Right now, the National Mall resembles nothing so much as an empty high school football field. But it could be much, much better.
Using a car-top video camera, USC researcher Andrew Curtis tracks disaster recovery over time.
U.S. cities in the South have their own set of challenges to face in going green. But Atlanta, for one, is trying.
Organizers of the London games have taken unprecedented measures to stop "lone wolves" from wreaking havoc. But that hasn't stopped them from making them a central part of this summer's festivities.
A kindergartener was arrested after she threw a tantrum in the principal's office.
In the realm of tall bridges, Aizhai takes first place as the world's longest.
Collectively, America's cities contribute more to global GDP than the rest of the world's cities combined.
Tokyo cartographers create cycling routes that resemble wild animals.
The U.K.'s first "lickable lift" raises horrific questions about what kind of flavors will be gracing the walls.
Just outside Washington, D.C., our small nonprofit collects extra food to help hungry neighbors.
Banned from a park, New York Occupiers take to camping on the sidewalks.
We're getting closer to understanding exactly what happens to our bodies when our bikes crash.
A video on what causes congestion, and how to fix it.
By awarding points for civic participation, MindMixer has helped cities across the country increase citizen engagement.
Paris, San Francisco, and Guangzhou have very different approaches to realizing big plans.