As we move toward an age of quiet gadgets that do everything possible not to get in our way, we’re losing our appreciation for all the magic under the hood. Not long ago, the sounds our devices made reminded us that they were doing something truly important, whether that task was connecting us to the Internet or bringing us back to the beginning of our favorite VHS movies. A child born today has a greater chance of hearing a real cloned dinosaur roar than a busy signal. But for those of us who lived through the beginning of the PC...