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Federal authorities are trying to defend against cyber attacks that impact the real world like chemical plants.
Federal authorities are trying to defend against cyber attacks that impact the real world like chemical plants.

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Tired of online tracking by advertisers?

A "do not track" button will stop online targeted advertisements. CNN's Dan Simon explains how.

Tired of online tracking by advertisers?

A "do not track" button will stop online targeted advertisements. CNN's Dan Simon explains how.