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Pulling deacon and gunnar hill away from their ipads. just ask their dad, joe. >> it really makes you think about just how these things in life happen for a reason. and to cherish it. >> reporter: their fascination with technology and the tablets themselves is the inspiration for an idea thats now gone global. both deacon and gunnar are autistic. and for joe communication with his two boys hasnt always been easy. >> thats sort of led me down the journey to the app itself. >> reporter: joe teamed...