The Secret Life of Machines: The Radio
tim hunkin · Documentary · YouTube title: The Secret Life of the Radio - Remastered
Why it's here
HN recommends the series as awesome and notes it is now legally on YouTube; commenters cite it for radio history.
What it covers
Remastered episode of Tim Hunkin's The Secret Life of Machines about the radio, covering its development including Hertz and Marconi experiments and Armstrong's FM radio in animated form.