And other findings from a mobile app that tracks how people in different cities spend their time.
So why are law enforcement agencies refusing to use it?
In six global cities.
How do you reduce the greenhouse gas emissions of skyscrapers? For starters, make a chart.
Rebuilding is never just a matter of putting back structures.
One of New York City's busiest streets doesn't have a full bike lane. The other night, some cycling advocates took matters into their own hands.
He wanted the way he ran his city to become a model for mayors everywhere. But can that idea persist once he's out of office?
One man's crusade to get restaurants, shops and offices to receive all their goods between 10 and 6.
Authorities were not happy.
Brooklyn CSA+D connects people interested in collecting art at a reasonable price point with artists who want their work to find a home.
The new operating system might reduce iPhone thefts.
The Center for Urban Science and Progress wants to study city problems — and to solve them.
Untangling the theory that local ideas can fix global problems.
New York's most famous building is going public.
The Eero Saarinen-designed TWA Flight Center is finally, maybe, getting a second life.
Inside New York City's plan to reduce the annual miles driven by its sanitation department.
Only 40 percent of young minorities in low-income New York City neighborhoods say they would feel comfortable calling 911 if they needed help.
After Hurricane Sandy, tight neighborhoods and centralized infrastructure recovered more quickly than spread-out areas.
This could be the most detailed open-data map of urban gerontology in existence.