1 2 3 1 _ _ _ 2 _ _ _ 3 _ _ _ ACROSS 1) an informal debt instrument; representing `i owe you' 2) a rapid automatic system to detect plastic explosives in passengers' luggage using x-ray technology and computers; designed for use in airports 3) a doctor's degree in dental surgery DOWN 1) an explosive device that is improvised 2) not divisible by two 3) north american republic containing 50 states - 48 conterminous states in north america plus alaska in northwest north america and the hawaiian islands in the pacific ocean; achieved independence in 1776 ** Scroll down for solution. ** Are you sure you want to peek? iou eds dds