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Todd Schneider

An App That Solves the Famed 'Traveling Salesman Problem'

What's the shortest route, if you're visiting each city exactly once and then returning to the point of origin?

Ifinity

Everything You Need to Know About the 2014 Bloomberg Mayor's Challenge Winners

Barcelona, Athens, Stockholm, Kirklees, and Warsaw won with high- and low-tech innovations that address pressing urban problems.

REUTERS/Chaiwat Subprasom

Good News: The L.A. Unified School District Is Giving Up Its Grenade Launchers

The district received the weapons through the same program that gave military equipment to the St. Louis County PD.

Flickr/Timothy Vollmer

Overall, America's Urban Parks Get High Marks

But there remains a divide in perceptions of access among less-educated, lower-income residents.

Flickr/chuwasg

Hey, I'm Bikin' Here! A Buffer Zone Is Now Law for California Cyclists

California drivers are now legally required to give cyclists at least three feet of clearance when passing. But do these laws really work?

Susan Sermoneta/Flickr

A Basic Shelter Can Make the Wait for the Bus Feel Shorter

Twin Cities riders believed transit arrived more quickly at shelters or stations compared with stops at curbside signs.

Sabina Ali

How an Oven Changed the Fate of a Neglected Toronto Park

Thorncliffe Park is now home to North America's first public tandoor oven, thanks to the efforts of local activists.

David Gray/Reuters

Saving the Clangs, Songs, and Shouts of Old Beijing

Hutongs are disappearing but their sounds won't, thanks to Colin Chinnery's Beijing Sound History Project.  

Vinogradov Illya/Shutterstock.com

Introducing 'City Makers: Global Stories'

Our new series about the people and ideas reshaping urban life all over the world, from the ground up.

Jrwooley6/Flickr

One of the World's Most Frenetic Cities Competes at Chilling Out

In a nation with the highest rate of stress-related suicides, citizens of Seoul vie for the title of most spaced-out.

Associated Press

Yes or No? A Voter's Guide to Scottish Independence

A primer on the key issues Scots are weighing at the ballots today.

How About a Crosswalk Light that Dances?

The makers of this gyrating Do Not Cross signal say it reduces jaywalking by 81 percent.

Evgeny Kovalev/Shutterstock.com

Antarctic Sea Ice Hits a Record Max, and That's Not Good

The increase in ice may actually be a sign the warming continent is in trouble.

Hail a New York Taxi, Get a High Five Instead

A random beardo is spreading surprise high fives all over the city.

TransitCenter

Millennials Love Transit Most, Boomers Still Stuck on Cars

A new study shows generations bucking their upbringings, with sheltered Millennials choosing the bus.

THE CANADIAN PRESS/Chris Young

Rob Ford Has Cancer

The controversial Toronto mayor will undergo chemotherapy for a "very rare" cancerous tumor.

San Francisco Municipal Transportation Agency

After Uber, San Francisco Has Seen a 65 Percent Decline in Cab Use

It might not be completely the fault of competition, but the city's taxi drivers are making far fewer trips than they were just a few years ago.

Lucy Nicholson/Reuters

Wealthy L.A. Schools' Vaccination Rates Are as Low as South Sudan's

Hollywood parents say not vaccinating makes "instinctive" sense. Now their kids have whooping cough.

Flickr/aldenjewell

On September 17, Remember the Amphicar

49 years ago, two of history's greatest boat-car hybrids heroically traversed the English Channel.