Artificial light makes the modern world possible. But not all kinds of light are good for us. Electric light has fundamentally altered our lives, our bodies and the very nature of our sleep.
The just-released seismic resiliency plan for Los Angeles goes beyond just saving lives; it hopes to ensure that the nation's second-largest city will still work after a magnitude 7.8 earthquake.
Oakland gains character as well as affordable housing from its stock of small and mid-sized apartment buildings. A retrofit plan is being prepared to strengthen this crucial part of the city's fabric against earthquake damage.
A $100 million effort to push the world's cities toward better disaster resistance is making a test case with a "gang of four" Resilient Cities: Alameda, Berkeley, Oakland and San Francisco.