Electromagnetic fields. Be forewarned, this involves science...

It helps to illustrate the effects of EMW on their surroundings. Helps to shed light on why things that measure the same, may not sound the same. Like, cables...

How does it illustrate why things might measure the same but not sound the same? 

@pekri

How do you get to your conclusion based on the words and context I wrote?
The first part was the history of some science., Not science. And I don’t have time to watch it now.

EMW you say. What pray tell are EMW?

EMW you say. What pray tell are EMW?

I presume ElectroMagnetic Waves. 

@artemus_5

My apologies. Was out of order.

EMF - electromagnet waves.

Spend too much time texting w 14yr old daughter. Short form is king, and doesn’t always work. 
You can see in the movie how an ac signal generates waves in a predictable pattern along the conductor. With the complex waves being generated by an audio signal going through a wire, those waves are going to, in turn, have an impact on the signal passing through the wire. That “feedback loop”, is going to change the signal. Not measurable I suspect because we are not yet measuring the right parts of the signal.