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Flake talks to CNBC's John Harwood about his fellow Arizona Republican Sen. John McCain, who is battling brain cancer.
It's easy to pay for nearly anything with credit cards but here are six expenses to never pay for with plastic.
Most of the officials who have faced scrutiny had been the target of complaints about their travel practices.
Devices like Construction Robotics' bricklaying robot could solve the construction industry's skilled labor shortage.
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