[subpar]

If this is interesting to you or your kids, here's a less detailed but pretty accessible video [1] explaining how mains hum forensics work, complete with British accent.

[1] https://www.youtube.com/watch?v=e0elNU0iOMY

[ShakataGaNai]

As soon as I saw this topic I knew someone would bring the Tom Scott. Excellent work!

[czbond]

Thank you - I was very interested!