Kuala Lampur, Chicago, Toronto, San Francisco, and Hurricane Sandy make this year's list.
Think your commute stinks? At least there's not a freezing microclimate happening inside your public-transit system.
The city's parallel transportation network, invented by companies like Facebook, Google and Apple, could be creating unforeseen consequences.
A music video about public space and community in Mumbai.
Wouldn't explosions in the sky be preferable?
Mirror, mirror on the wall, who is the biggest nerd of them all?
Polar bear plunges around the world.
The city-focused mobile technology we had the most fun with this year.
By lunch time, officials had already collected more than the 1,673 weapons exchanged last year.
Charter cities, sexy villages, company towns, and more.
The 2012 International Poznań Ice Festival.
Can the good work of the Green Impact Zone be sustained once federal funds run out?
Highlights from the Sierra Club's list of the country's 50 best and worst.
The super-storm was a wake-up call to cities. But will they keep their climate change preparation going?
Also, Mumbai outlaws spitting tobacco on buses and Swaziland bans clothing that could tempt men to rape.
Like being a kid again...a kid with state-of-the-art technology and materials.
The new building will slope up to 38 stories, with a giant courtyard, almost the size of a football field, cut out of the center.
China's fastest trains were unveiled today. Why the northeast corridor won't be getting similar treatment any time soon.
Nods to Christmas in Breezy Point, Queens.