Science / Tech News Last Update on December 22, 2014 08:06 GMT IN THE NEWS: NYPD KILLER RANTED ONLINE BEFORE SHOOTING NEW YORK (AP) -- New York City's police commissioner says the gunman who killed two police officers had made online posts that were "very anti-police." Commissioner William Bratton didn't get into the specific contests of the posts. But before the shootings, Ismaaiyl Brinsley wrote on an Instagram account: "I'm putting wings on pigs today. They take 1 of ours, let's take 2 of theirs." It's a reference to the police killing of Eric Garner, an unarmed black man who died after an officer put a chokehold on him. A grand jury declined to indict the officer involved in the videotaped confrontation, leading to protests in a number of cities. IN THE NEWS: THE FUTURE OF "DRIVERLESS CARS" LOS ANGELES (AP) -- You've heard talk about the coming advent of driverless cars. But the process will be taking a bit longer than first thought. In California, the Department of Motor Vehicles will miss a year-end deadline to adopt new rules for cars of the future. The reason: regulators have yet to determine whether cars without human drivers are safe. Several companies have been testing prototypes on the road. But regulators want to make sure that such vehicles do things like obey all traffic laws. They also want to know what the cars should do in their computers freeze up -- or how easily they can be overridden by human drivers.