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A giant geometric flare unleashed by the sun threatened to disrupt airline and satellite communications and trigger shutdowns on electrical power grids Wednesday. Margaret Warner talks to an expert about what causes solar flares and how they affect Earth.

Wind-swept wildfires have consumed 522,000 acres of Southern California, destroyed 1,552 homes and claimed 17 lives. Jeffrey Kaye of KCET-Los Angeles provides a firsthand view of the devastation from the fireline in San Bernadino.

Hydrogen power, a prospective candidate in the race to find a non-fossil fuel source, has the potential to fuel vehicles for transportation and generate most of the world's electricity. Tom Bearden reports on the process of bringing hydrogen fuel from…

China's mammoth Yangtse River will soon be controlled by the largest dam ever built, but the edifice is still not strong enough to quell the tide of corruption. Ian Williams of Independent Television News reports on some of the human…

Four decades after the height of the space race between the United States and the Soviet Union, China became only the third country to launch a person into orbit. Ian Williams of Independent Television News reports on the Chinese entry…

Two biochemists were honored with the Nobel prize for chemistry in recognition of their discoveries of the tiny channels that let vital substances move through cell walls. Margaret Warner talks to Peter Agre, one of the prize recipients.

Western regions of the United States continue to cope with the decimation caused by the lack of rain. Ted Robbins of KUAT in Tucson, Ariz., provides an update on the drought.

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