The history of public communication system

German scientists dug 50 meters down and discovered small pieces of copper. After studying these pieces for a long time, Germany announced that the ancient Germans 25,000 years ago had a nation-wide telephone net.

Naturally, the Russian government was not that easily impressed. They ordered their own scientists to dig even deeper. 100 meters down they found small pieces of glass and they soon announced that the ancient Russians 35,000 years ago already had a nation-wide fiber net.

American scientists were outraged by this. They dug 200 meters down & found absolutely nothing. They happily concluded that the ancient Americans 55,000 years ago had cellular telephones.

note: fiber net——光纤网络　cellular telephones——蜂窝式移动电话