The trouble with those clever tests of humanity, according to hackers analyzing the CAPTCHA on the sla.ckers.org message board, is that both images sources are public.

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McCain sources say Palin has gone off-message several times, and they privately wonder whether the incidents were deliberate.

CNN: Palin's off-script comments irk McCain aides

With each stop on their itinerary, Piccard and Borschberg bring with them a message: Use technology that saves energy and support government-mandated targets for creating electricity from renewable sources.

CNN: Funny-looking plane designed to make history