Last year, someone kept hacking into traffic signs in Dallas - corrupting bland electronic messages into jokey missives such as: "Work is Canceled - Go Back Home" and "Donald Trump Is A Shapeshifting Lizard!!"
On Friday night, 18 minutes before midnight, every single one of Dallas's 156 emergency weather sirens went off. The sirens, whose purpose is to be heard by anyone caught outdoors in a tornado or dangerous storm
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