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This morning, power was restored to almost 4 million residents in Arizona, Southern California, and northern Mexico after a major blackout swept through the area yesterday afternoon.

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I love science, and I love the scientific method.

Common batteries are electrochemical cells. And they may get better thanks to living cells: the multicellular organism called brown algae.

Few things remain as mysterious--or controversial--as our own history as a species. [More]

In the second of three videos, we visit the central hub of New York City's 'Ring of Steel', the expansive camera network keeping watch over Lower Manhattan.

* Flooding persists in Pennsylvania, other states * Swollen Susquehanna River crests in city of Wilkes-Barre [More]

From building-blocking bollards to millimeter-wave scanners , the September 11 terrorist attacks have led to significant changes in security techniques and technology worldwide over the past decade to discourage future attacks and to avoid being surprised again. To meet these goals, law enforcement and counterterrorism operations worldwide have come to rely heavily on surveillance of public spaces. Nowhere is surveillance more pervasive in the U.S

Though burning natural gas produces much less greenhouse gas emissions than burning coal, a new study indicates switching over coal-fired power plants to natural gas would have a negligible effect on the changing climate. Tom Wigley, a senior research associate at the National Center for Atmospheric Research, reports that if natural gas were substituted for coal in energy production, climate change trends would not slow down and may, in fact, accelerate. His findings are due to be published in the journal Climatic Change Letters

The terrorist attacks of September 11th drastically changed the security strategy of NYC. A massive camera network, dubbed the 'Ring of Steel' , is at the heart of this new strategy. In the first of three videos we watch it as it watches us.

By Roberta Rampton ROCKVILLE, Maryland (Reuters) - Last month's record earthquake in the eastern United States may have shaken a Virginia nuclear plant twice as hard as it was designed to withstand, a spokesman for the U.S. nuclear safety regulator said on Thursday.

The attacks of September 11, 2001, were a shocking and emotionally raw event that most adults, especially in the U.S., still have trouble comprehending . For children under 14, however, the events of that day are but a page of history, a modern-day Pearl Harbor. Now, with the 10th anniversary of these attacks upon us, psychologists, educators and parents are thinking again about how best to teach children about the traumatic day and its aftermath--as well as the complicated threat of terrorism .

More than half-a-billion smartphones will likely be sold in the coming year.

The terrorist attacks that shook the United States 10 years ago had effects that reached all the way into space. Not only did the events of Sept. 11, 2001, prompt NASA to immediately beef up its already strict security procedures, they forced military space officials to reassess their priorities regarding space security and triggered a shift in space policy .