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NASA/NOAA

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."

Reuters

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

Personal Rapid Transit tries for a comeback.

Alexander Dunkel

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.

Scott Weaver/Vimeo

Replica of the Day: Cities Made of Toothpicks

Toothpick cities, two ways.

Reuters

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?

Fabrizio Bensch/Reuters

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.

Reuters

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.

Reuters

Why New York's Sandy Commission Recommendations Matter

Climate adaptation policy remains pretty untested.

tagtool.at

Incredible Hallucinatory Graffiti, Courtesy of Your iPad

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

Reuters

This Latest Upgrade Won't Fix Amtrak's WiFi

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

gui jun peng/Shutterstock.com

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.

CTBUH

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.

Reuters

It's Official: The Weather Is Extremely Insane Right Now

Extreme heat in Australia, snow in the Middle East.

Reuters

It's Lonely Trying to Convince Chinese Hospitals to Go Smoke Free

Dr. Dan Xiao battles attitudes toward tobacco that more closely resemble the U.S. of the 1940s or '50s.

The NHL May Have Been Quiet, But Teams' Real Estate Guys Sure Were Busy

During the lockout, some teams changed arenas, others asked for new ones, and some even pushed forward with condo towers and complexes.