Hyderabad, June 12 -- Remember the days when a radio set used to be the prized possession of an average middle-class family. The advent of the 1980s heralded the arrival of idiot boxes. Stereo sets invaded the showcases a decade thereafter. The CD and DVD players were forerunners of the computers. The cellphones merged and miniaturized them all to sit into our pockets or vanity bags. An avalanche of new technologies has revolutionized the infotainment world in less than half a century. We have been witness to the advent, rise, and obsolescence of an array of gadgets and technologies. How many of us have taken care to preserve some of those gizmos that coloured our drab and dreary lives with sounds, music, images, texts, motion, and colour...