A very long time. Talking drums[1] seem to have been around forever. There was a good chapter on this in James Gleick's The Information[2]. [1] https://en.wik

A very long time. Talking drums[1] seem to have been around forever. There was a good chapter on this in James Gleick's The Information[2]. [1] https://en.wikipedia.org/wiki/Drums_in_communication https://en.wikipedia.org/wiki/Drums_in_communication [2] https://en.wikipedia.org/wiki/The_Information:_A_History,_a_Theory,_a_Flood https://en.wikipedia.org/wiki/The_Information:_A_History,_a_...