When it comes to communicating, some things never change.
The african drum. Many would say it was an musical instrument. It is. But, it is much more than that. African drums were a way of communicating over vast distances in ancient Africa.
If there was a herd coming or an enemy was approaching, drummers would send messages through their drums to neighboring villages. The messages would be repeated again and again and to send the message further.
It ends up that modern technology does something similarly. Messages in your telephone are repeated so that the volume isn’t loss and this allows messages to be sent over long distances.
But the most mind-blowing stuff that the ancient Nubians discovered is that if you drum a message near the banks of the Nile, the message can be sent over the surface of the water without losing volume. Scientists would say there is a a lossless channel at the interface between the water and air. That means you could whisper something and someone across the Nile nearly 2 miles away could hear it.
Today, we seek such an ability with optical fibers. The challenged is to send a message without it losing volume and without the need for lots of repeaters. It seems the some of the issues of the past are still present today. Showing that there really isn’t anything new under the (African) sun.