Because of the rapid use and implementation of communication technology, its self-evident. In the beginning you couldn't have known that other beings existed besides what you saw with your own eyes, then when writing was done on wax tablets and other means like rock and wood you had to send a man on horse to obtain that information, then when electricity was harnessed we found a way to extend our reach to a certain area, now with the invention of the internet we have it within our fingertips immediately. Trace backwards from the computer to the telephone, to the telegraph to writing, to the use of pigeons.
