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We're at university together http://poweltonvillage.org/cheapest-online-essays/ india homework help Previously the Fence worked by broadcasting radar signals into space and receiving signals anytime an object crossed the threshold of this radio signal. Though this system quickly alerted Air Force officials about possible intruding objects, the data was sometimes spotty and not always accurate. The Air Force now says the temporary system they’ll be setting up in Florida and North Dakota will be more accurate than the old Fence.