A long time ago, some 50 years ago, on the evening of October 29, 1969, at the University of California, Los Angeles, two scientists, Leonard Kleinrock and Charley Kline, were conducting a seemingly little experiment. We still feel the effects of their hard work. Their serious problem was forcing two distant computers to exchange information between them. Nowadays, it is the norm and the obvious, and 50 years ago, it was a practically unsolved technical problem until that late evening.