radio waves

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.

A tour of the historic WLW transmitter facility in Mason, Ohio, recorded at Hamvention 2013. It shows the surviving equipment from the 500,000 watt AM era, when WLW was the only US station at that power, and explains the history.

A Radio Free Asia report from its China food safety series on how "gutter oil" is recovered from sewers and waste and sold on to cheap restaurants and street vendors.

Mentour Pilot's 56-minute account of the MH370 disappearance and what is now known, including the WSPR radio tracking technique and other sensing methods. It was made ahead of renewed search efforts.

A Ukrainian documentary about the liquidators who cleaned radioactive debris off the Chernobyl reactor roof in two-minute shifts. It presents their firsthand accounts and footage of the work.

A documentary on how Cornwall became a hub for the world's communications, from the first transatlantic radio signal to modern undersea fibre cables. It describes how cable landing stations and the systems are put together.

TechAltar's history of Philips, once Europe's largest tech company and a world leader in lighting, radio and physical media. It traces how the company sold off or spun out its businesses, until little remains but the licensed name.

BBC Earth shows killer whales working as a pod to create waves that wash seals off ice floes, with the producer explaining how the crew captured behavior once thought a myth.