Several companies are building robots that might eventually drive cars, give quadriplegics physical functionality or even replace soldiers on the battlefield.
As officers gave chase, guns at the ready in double-handed grips, they were trailed by dozens of civilians with cameras and cellphones held above their heads to record the action.
When a prudent candidate like Mitt Romney picks someone like Representative Paul D. Ryan of Wisconsin as his running mate, it suggests that he felt he held a losing position against President Obama.
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