Ancient life may be just one possible explanation for Mars rover's latest discovery

This is a selfie taken by NASA's Curiosity Mars rover at the "Rock Hall" drill site. (NASA/Caltech-JPL/MSSS) This is a selfie taken by NASA's Curiosity Mars rover at the "Rock Hall" drill site. (NASA/Caltech-JPL/MSSS)

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NRA opens gun convention in Texas after school massacre

The National Rifle Association begins its annual convention in Houston on Friday, and leaders of the powerful gun-rights lobbying group are gearing up to "reflect on" -- and deflect any blame for -- the deadly shooting earlier this week of 19 children and two teachers at an elementary school in Uvalde, Texas.

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