Since the invention of television and television, video editors have been well aware of the technique of simultaneous mixing of several images on an appropriate number of screens or sub-screens:
While different techniques are used for this manipulation, they all have one thing in common: sound. That is, by combining several video streams into one, editing involves muting or completely destroying the sound, since the pictures will speak in discordance.
For a long time, this was probably the case, until people were found who brought together the broadcasts of global television news:
To the great surprise of the author of the video, the characters of global television not only spoke without interrupting each other, but also broadcast as one chorus, absolutely in sync.
The topic is discussed with interest in the comments to the video and at the ameroblogodrome. People cannot understand: what is it? Matrix? Or on news channels on TV, bio-robots controlled by the same program?