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Japan's earthquake and tsunami put the nation at the brink of a healthcare disaster. Dr.

NATIONAL HARBOR, Md.--Silicon translates sunshine into electricity--and Earth receives enough sunshine in a daylight hour to supply all of humanity's energy needs for a year. But despite being as common as sand, photovoltaic panels made from silicon--or any of a host of other semiconducting materials --are not cheap, especially when compared with the cost of electricity produced by burning coal or natural gas.

Stare at the tiny, central black fixation spot on the white cross in a . After 30 seconds, transfer your gaze to a neutral gray background. You should see a dark--almost black--cross fading in and out.

Physician Assistants Number in 2008: 74,800 [More]

Dr. Jennifer Ashton spoke with Erica Hill on who is most at risk of radiation exposure after Japan's Fukushima Dai-ichi nuclear power station experienced a partial meltdown.

1. Facebook 's leaping aboard the daily deals/coupon bandwagon, and will be testing out its own Groupon-like service in a limited list of U.S.

NATIONAL HARBOR, Md.--Every day the U.S. imports $1 billion worth of oil.

The threat of cyber-war--and of a catastrophic hacker attack to Germany's industrial or military infrastructure--is spurring the creation of two new high-level government organizations. The Federal Republic of Germany has just released a comprehensive cyber-security strategy that will create two high-level government agencies devoted exclusively to cyber-war

By Ed Bell and Phil Saunders [More]

Dr. Jennifer Ashton on varying degrees of danger people in Japan face, what could happen and how soon

"What's the short code for American Idol?" asks Joseph Gillespie, CEO of mobile marketing company Zoove, referring to the show's text-message voting system. "It's the largest use-case in history, but no one can remember it because the number doesn't make any sense." How brands connect to consumers is a huge headache for marketers--not just Idol fans--who've now tried almost every trick in the book to get your attention. SMS messages ("Text YES to 45938993"), QR codes, Facebook profiles, website addresses--you can't find an advertisement today that doesn't feature at least one of these marketing tactics

The founder of the Web message board 4Chan took the stage at SXSW to explain how his new project, Canvas, could far exceed 4Chan's 12-million-user popularity with Facebook-friendly appeal. Like your daughter bringing home an ex-convict for dinner and saying that he's actually a "really good guy," Christopher "moot" Poole explained how the virtue of 4Chan--instantaneous collaborative creativity--could overshadow its darker, dirtier proclivities by gaining new life in a project called Canvas .

Jimmy Roberts interviews Nick Watney after winning the 2011 WGC-Cadillac Championship at Doral in Florida. (NBC Sports)

Johnny Miller and Dan Hicks wrap up the WGC-Cadillac Championship at Doral and discuss Nick Watney's win, Tiger Woods' strong finish and more. (NBC Sports)