1 2 3 1 _ _ _ 2 _ _ _ 3 _ _ _ ACROSS 1) a rapid automatic system to detect plastic explosives in passengers' luggage using x-ray technology and computers; designed for use in airports 2) the ratio of the circumference to the diameter of a circle; approximately equal to 3.14159265358979323846... 3) mother of the ancient irish gods; sometimes identified with danu DOWN 1) an independent federal agency established to coordinate programs aimed at reducing pollution and protecting the environment 2) a loud harsh or strident noise 3) an independent government agency responsible for the social security system ** Scroll down for solution. ** Are you sure you want to peek? eds pis ana