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  • Huge asteroid to buzz Earth in November

    On November 8 and 9, the quarter-mile-wide asteroid 2005 YU55 will zoom past the Earth, coming within about 200,000 miles, a distance closer than our moon.
    05/09/2011 05:39 pm

  • Tucson district in turmoil over state ban on ethnic studies

    The Tucson Unified School District is considering turning ethnic studies courses into electives. The current setup may be out of compliance with a state law took effect Jan. 1.
    05/04/2011 02:32 pm

  • Guns in government buildings? Four controversial gun rights bills in Arizona.

    The Arizona Legislature is considering an array of bills that would ease state gun control. The bills have generated controversy, since they were crafted only weeks after the Jan. 8 mass shooting in Tucson, Ariz., that killed six and wounded US Rep. Gabrielle Giffords and 18 others. Among the gun-related bills working their way through the Republican-controlled legislature:
    03/23/2011 06:56 pm

  • Scientists investigate intergalactic space blob: What is it?

    A schoolteacher discovered a blob of glowing hydrogen gas – called Hanny's Voorwerp in her honor – that astronomers say points to a nearly-invisible quenched quasar.
    01/19/2011 07:09 pm

  • Gabrielle Giffords office is open, helping constituents and providing solace

    Gabrielle Giffords would want the work of her congressional office to continue, her staff says. But reminders of change are all around as people pay tribute to Gabrielle Giffords and the others shot Saturday.
    01/13/2011 12:32 pm

  • Obama calls for unity, humility at Tucson memorial

    At a memorial for the victims of the mass shooting in Tucson, Ariz., Saturday, President Obama sought to move beyond finger-pointing to healing. He said of 9-year-old Christina Taylor Green, who was killed: 'I want to live up to her expectations.'
    01/12/2011 10:54 pm

  • The Vote Obama's role at Tucson memorial service tonight: healer-in-chief

    At Tucson memorial service Wednesday, Obama shoulders the duty of trying help a shaken nation heal. After the apparent targeting of a US congresswoman, what will he say? What should he say?
    01/12/2011 07:22 pm

  • Lone ranger: Tucson's tough-talking sheriff suddenly has national spotlight

    Clarence Dupnik, sheriff of Pima County, called Arizona the 'capital' of hatred after the Gabrielle Giffords shooting. He's no stranger to controversy. He has said the tea party brings out the 'worst in America' and called Arizona's immigration law 'racist.'
    01/10/2011 11:37 pm

  • Ethnic studies classes illegal in Arizona public schools as of Jan. 1

    Much of the controversial Arizona immigration law remains tied up in court, but a law banning ethnic studies in Arizona is set to take effect Saturday. A Tucson school district vows to fight it.
    12/31/2010 10:47 am

  • What's new with Titan? Five intriguing findings about Saturn's moon

    Like many a robotic planetary mission, you've gotta love the Cassini-Huygens mission to Saturn – a joint effort between NASA and the European Space Agency. It launched in 1997 and for the past six years (yes, it took some time to get there), Cassini has been the gift that keeps on giving. Saturn's largest moon, Titan, continues to be one of Cassini's most intriguing targets. It's the only planetary satellite with a thick atmosphere – a hydrocarbon haze that makes a smoggy day in Los Angeles look crystal clear by comparison. And although it's a cold moon, with lakes of liquid methane, Titan has many of the compounds that on Earth were the building blocks for organic life. It's high on the list of "let's go back" destinations among astrobiologists. So far, Cassdini has performed 73 flybys of Titan, including eight this year. Here are some of this year's eye-popping discoveries associated with Cassini's observations of Titan.
    12/22/2010 05:10 pm

Editors' picks:

Doing Good


What happens when ordinary people decide to pay it forward? Extraordinary change...

Endeavor Global, cofounded by Linda Rottenberg (here at the nonprofit’s headquarters in New York), helps entrepreneurs in emerging markets.

Linda Rottenberg helps people pursue dreams – and create thousands of jobs

She's chief executive of Endeavor Global, a nonprofit group that gives a leg up to budding entrepreneurs.

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