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The Frustration of San Francisco's Mass-Transit Riders, Visualized

If one were to somehow take a mental-health reading of commuters at 6:30 p.m. on a Monday, it would look something like this "Frustration Index."

Retail Redlining: One of the Most Pervasive Forms of Racism Left in America?

Why do retailers, restaurants and grocery stores stay out of communities that can afford (and want) them?

Shepard Fairey's Andre-the-Giant Street Art Gets the Movie Treatment

Julian Marshall explains why he wanted to make a film about the "Obey Giant" street-art campaign.

Public Health Initiative of the Day: No Salt For You

Mexico City's "Menos sal, más salud" encourages restaurant owners to make salt shakers available only for those who request them.

Why the Boston Marathon Is an Especially Sinister Target for Terror

The bombings have turned all the cues and surroundings of this time of year upside down.

There Is Almost Definitely Camera Footage of the Boston Marathon Attackers ... Somewhere

The city of Boston is blanketed with security cameras. But finding the right shots is a little like looking for a needle in a hay stack.

The 71 Countries Targeted in Boston

Participants in the 2013 Boston Marathon hailed from across the globe.

Light in the Darkness: Messages of Hope From Around the Country

"We thought in this moment it was important show solidarity as caring human beings."

Rio's Completely Misguided Anti-Rape Effort: Cut Vans Used by the Poor

Rather than improving police accountability, the city inexplicably took away an important source of transportation.

A World Without Trash Cans?

Early reports suggest at least one of the bombs used in yesterday's Boston Marathon attack was hidden in a garbage can. There's a case to be made for removing them all.

In 1894, the 'New Woman' Was a Bicyclist Who Changed History

A documentary details the story of Annie "Londonderry" Kopchovsky, who rode around the world on two wheels in 15 months.

Beijing's Bomb Shelter-Dwellers May Be Making a Rational Choice About Their Commute

The Chinese capital estimates 10 percent of its population lives in tiny, below-ground apartments. Are they crazy or clever?

An 'Eerie' Stillness Lingers in Boston

Locals on social media report a distinct lack of chaos, "just a feeling that everyone is focused."

Major U.S. Cities Remain on High Alert Following Boston Marathon Attacks

New York, Los Angeles, and Washington, D.C. have stepped up police presence on transit, at tourist attractions, and near hotels.

Why People Perceive Some Cities as Safer Than Others

There are reasons why places like Boston have tended to think of themselves as relatively safe compared to say, New Orleans.

Resilience Does Tend to Follow Horror

If there's an uplifting lesson from Boston, it may be the many people who will overcome the trauma of tragedy.

The London Marathon Will Go On This Weekend, Organizers Say

Race officials are reviewing security precautions with local police after the attacks in Boston Monday.

When You Attack a Crowd of People, You Also Get a Crowd of Witnesses

This is more true than ever in the digital age.

The Boston Marathon Is Held on Patriots' Day, Which Has Become an Unofficial Anti-Government Day of Action

Modern-day militia activists have attempted to hold rallies on this holiday in recent years.