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Visible chains of long distance signaling, known as optical telegraphy, have also been used throughout history to convey limited types of information.

Thus, political, religious, and commercial interests have historically controlled, expanded, and monitored communications channels.

The spread of paper and the printing press from China to Europe preceded a major advance in the transmission of news and new channels.

Visible chains of long distance signaling, known as optical telegraphy, have also been used throughout history to convey limited types of information.

Thus, political, religious, and commercial interests have historically controlled, expanded, and monitored communications channels.

The spread of paper and the printing press from China to Europe preceded a major advance in the transmission of news and new channels.

Visible chains of long distance signaling, known as optical telegraphy, have also been used throughout history to convey limited types of information.

Thus, political, religious, and commercial interests have historically controlled, expanded, and monitored communications channels.

The spread of paper and the printing press from China to Europe preceded a major advance in the transmission of news and new channels.