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BBC News - Defiant protesters challenge Arizona migrant law
Hundreds of protesters converge on Phoenix, Arizona, to demonstrate against the state's anti-immigration stance, the BBC's Rajesh Mirchandani reports.
08-01-2010 by walterkovacs Tags arizona, challenge, migrant, news, protesters

Haiti challenge
Rebuilding a devastated economy
03-13-2010 by eddiedolan Tags challenge

Obama's Middle-Class Tax Pledge in Question as Deficit Challenge Looms
The Obama administration once again is stirring fears that the president may break a key campaign pledge, after he was quoted saying he is "agnostic" about raising taxes on those making less than $250,000. 
02-14-2010 by dandreiberg Tags challenge, class, deficit, looms, middle, obama, pledge

Can a new format challenge LEDs for energy efficiency?
Can a new display technology challenge the energy efficiency of LEDs?
02-06-2010 by dianeadamson Tags challenge, efficiency, energy, leds

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