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UNICEF Wants Us to Talk About Urban Inequality

An online forum invites insight from the people who work on the ground in the world’s biggest and most dysfunctional cities.

A Breakdown of What Exactly Is in Beijing's Filthy Air

Climate Desk lays out the contents of China's air pollution.

Do Cities Really Take the Lead on Climate Change?

They may tend to adopt easier policies first, according to a new report.

NASA Satellite Image Shows Beijing Drowning in a Lake of Smog

Air pollution has been particularly bad in China this week, with levels nine times above what the U.S. considers "unsafe."

Would More Drivers Use Mass Transit if It Mimicked Private Cars?

Personal Rapid Transit tries for a comeback.

What Flickr Can Teach Us About the Way We Photograph Cities

Maps of data offer a precise understanding of the where we shoot different landmarks.

Replica of the Day: Cities Made of Toothpicks

Toothpick cities, two ways.

What We Can Learn From the Largest Gathering in Human History

This week, 30 million people will gather in Allahabad, India. Among them: Harvard scientists asking how on earth is an event of this size possible?

Strip Down and Ride the Subway

Improv Everywhere's annual no-pants transit ride goes international.

What Our Urban Planning Vocabulary Says About Our Cities

A look at how the words we use have evolved.

This Is What the Opposite of Gun Control Looks Like

In a planned community in Idaho, all teens would be required to carry loaded AR-15s.

Beijing's Air Quality Catastrophe

Pollution has reached an all-time high, reminding us that China's economic growth has come at the cost of environmental disaster.

The Case for Shared Green Spaces

 A recently revitalized "pocket neighborhood" in Little Rock strengthens the area and protects the environment.

Why New York's Sandy Commission Recommendations Matter

Climate adaptation policy remains pretty untested.

Incredible Hallucinatory Graffiti, Courtesy of Your iPad

The Tagtool app may cost an arm and a leg, but the results are weirdly fantastic.

This Latest Upgrade Won't Fix Amtrak's WiFi

The best commuters can hope for is very fast internet very occasionally.

Does Human Capital Tend to Cluster in Center Cities or the Suburbs?

According to new research, where college-educated folks live has a lot to do with population size.

Skyscraper Record Breaker of the Day: Mecca

And other findings from a report on very tall buildings...

A Flash Mob Performs 'Here Comes the Sun' in a Spanish Unemployment Office

Equal parts heartbreaking and heartwarming, we think.