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Choose One, Millennials: Upward Mobility or Affordable Housing

The paradox of the American Dream: The best cities to get ahead are often the most expensive places to live, and the most affordable places to live can be the worst cities to get ahead.

Napper Architects, Courtesy of Something Concrete and Modern

Why an Ambitious, Fanciful 'Linear City' Failed

A Le Corbusier-inspired idea for a city that organized transit and architecture around "functional delineation" was never realized.

David W. Cerny/Reuters

Prague's 'John Lennon Wall' Gets an Apolitical Makeover

The famous landmark has been a protest-art site for decades. Now, Praguers are divided on whether "Wall is Over."

Arko Datta/Reuters

To Kiss or Not to Kiss in Indian Cities

Why young people are taking to the streets just to smooch in public.

Marcel Marchon / Flickr

Silicon Valley Could Offer a Public Bus Commute That's Quicker Than Driving

The El Camino BRT project shows why great transit needs exclusive lanes.

Ron Ingram/MECC

Acid Rain Has Turned Canadian Lakes into a Kind of Jelly

A legacy of industrial pollution is allowing slimy ooze to thrive.

Robot Town Sagami

Japan Now Has a Traffic Signal Shaped Like Astro Boy

But can it aerate jaywalkers with retractable butt guns?

Heatherwick Studio

Why You Keep Seeing Plans for Off-Shore Parks

Building over-water park infrastructure is one approach for dense cities. But are these parks a flashy design fad or a real urban solution?

Esteban Moro and colleagues

What Twitter Can Tell Us About Unemployment

Where, when, and how people tweet reveals information about the socioeconomics of a region.

These Passengers Are So Pumped About Riding in a Really Fast Train

Reaching 311 miles per hour on a test track in Japan makes for some giddy responses.

WBEN NewsRadio

A Towering Wall of Snow Fell on Buffalo

It's one of the most striking lake-effect snowstorms in recent memory.

Flickr/Stewart Chambers

Why London Renters Often Have Fewer Rights Than Those in Other Expensive Cities

Margaret Thatcher's legacy can still be felt in today's "revenge evictions" controversy.

Anthony Flint

Ushering in an Era of Concrete Destruction

Cities spend big money to retrofit and modernize landscapes built with the world’s most popular construction material—even as others go right on pouring it.

NYCLink

R.I.P., Pay Phones. Hello, 'Links'

NYC's swanky future pay phones will provide unlimited Wi-Fi and free domestic calls. But will they be accessible to everyone?

dominique landau/Shutterstock

Cleaning Up Urban Waterways With Manmade Islands

The brains behind Scotland's Biomatrix Water use flotillas of plants to filter polluted water and soften concrete riverbanks.

Norway's New Passports Are Designed to Make Every Other Country Feel Inferior

The travel documents come on the heels of those super-cool new banknotes, too.

AP Photo/U.S. Air Force, Staff Sgt. Shawn Nickel

Watch the Invisible Patterns of Air Travel Over Some of the Busiest Skies in the World

The UK's National Air Traffic Services offers an animated tour of just how flight paths are managed.

Associated Press

Mapping 20 Years of Major Meteor Impacts

NASA wants to use this project to predict Earth's next dangerous space rock.

Dean Clark

Meet San Francisco's Newest Mayor, Who Is a Dog

Today City Hall celebrates Frida, a 6-pound chihuahua mix and very good girl.