Concentric circles of rocky hills and valleys in South Africa tell the story of a billion-year-old collapsed volcano
"We suspect that things aren't normal anymore," one expert says, as raging blazes spark debate over role of climate change
In wake of deadly theater shooting, Louisiana Gov. Bobby Jindal is touting recent reforms he enacted -- how do the other governors in the running stack up?
Security firm says hackers could steal personal data off millions of Android phones with a sneaky text message
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