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If we are to improve the quality of life in our cities--27 of which are expected to have more than 10 million people by 2020--we will have to find a better way to build them. MIT's new software will help.

Irene did less damage than expected, but when the next big storm comes (and it will), cities that have made innovative decisions in how they run operations will be better off. Thankfully, Hurricane Irene turned out to be much weaker than predicted.

Special Issue: Cities The city is a solution to the problems of our age, and this week, we present it in the true urban spirit: best ideas forward

Could it happen here? That was the big question in the U.S.

For years scientists have urged national leaders to tackle climate change, based on the

The Cities are the topic of the month here at Scientific American (and at least this week on the blogs), so I should chime in on an aspect of urban ecology that I am comfortable discussing – the effects of increased light at night on animals. [More]

Special Issue: Cities The city is a solution to the problems of our age, and this week, we present it in the true urban spirit: best ideas forward

They're wide-eyed students interested in entrepreneurship, but they're eschewing incubators and sidestepping venture funding. What gives? Elizabeth Weber has been paving her own path to entrepreneurship for years

The deadly mob violence that wracked England this past week has abated, as police came out in force and used surveillance images to track down and arrest some 1,900 alleged rioters. As London and other cities in the nation recover, officials and the public may be left wondering how to prevent such rioting in the first place. A key misunderstanding, however, seems to pervade popular thinking: that mobs are irrational and are driven to violence by a few bad apples

Burning Man isn't just about getting crazy on the Playa anymore. The organization is now taking on urban revitalization, aiming to fix up the area around its new HQ.

These gorgeous videos show the patterns of drivers in three major cities: where they're going, and where they get stuck. Los Angeles managed to survive Carmageddon , with some help from Ashton Kutcher and traffic updates from Waze , a service that utilizes the GPS-enabled phones of its users to compile traffic maps. A few months ago, Waze made a slick video of a day of L.A.

Andrew Yang, through Venture for America, wants to send an army of new college grads out to start-ups in cities nationwide and help resuscitate their faltering economies. Andrew Yang believes entrepreneurs can help save cities, especially those whose economies have been ravaged by the recession.

Andrew Yang, through Venture for America, wants to send an army of new college grads out to start-ups in cities nationwide and help resuscitate their faltering economies. Andrew Yang believes entrepreneurs can help save cities, especially those whose economies have been ravaged by the recession. Yang gave up a law career almost immediately after he started, realizing the mega-firm life was "a less than ideal use of a lot of smart people's time." He founded Stargiving.com, a celebrity affiliated philanthropic fundraising site in 2000, right at the end of the dot.com bubble

What strategies can you learn about running your business from Switzerland? One of the most fascinating elements of Switzerland's success is its determination to remain neutral under unimaginable pressure to pick sides. The country has not declared a state of war since 1847 (it never entered the World Wars or the Iraq war) and opted out of joining the European Union.