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      4/7: Investigators race toward possible Malaysia Airlines "pings"; Navy unveils new futuristic weapon

      |Investigators have detected two distinct pinger frequencies consistent with flight and cockpit recorders in the search for Malaysia Airlines Flight 370; and, the U.S. Navy revealed a weapon that's been under secret development for years. The electromagnetic rail gun can shoot a projectile well over 100 miles at Mach 7.

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