Why are some street lights purple in Vancouver? Here's what the city says

Purple street lights seen in downtown Vancouver, B.C. Purple street lights seen in downtown Vancouver, B.C.

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San Francisco will allow police to deploy robots that kill

Supervisors in San Francisco voted Tuesday to give city police the ability to use potentially lethal, remote-controlled robots in emergency situations -- following an emotionally charged debate that reflected divisions on the politically liberal board over support for law enforcement.