Glancing around, all I see is that the streets are heaved with boisterous groups of people. Everyone is preoccupied with thoughts of his or her individual business. Passing by a lady engaged into a conversation with a friend, I stop to gaze through a window. A man shuts the computer off, rummages through papers, and prepares to go home to his family. A bunch of teenagers pass by me, after purchasing the latest CDs from the music store. Many years later, this typical scenario has changed drastically. A lady passes by quickly, talking to her friend and to someone else on her cell phone at the same time. A man exits his office clutching his laptop, since he plans to work until midnight. Music stores have few customers because all teenagers are at home formatting music onto an MP3 player. How have these small innovations suddenly revolutionized our...