[jpatokal]

The article mentions the listening bug in the Great Seal in a side note, but it's arguably an even better hack:

https://en.wikipedia.org/wiki/The_Thing_%28listening_device%...

[acqq]

I was glad to learn that "The Thing" was apparently designed by Léon Theremin who invented in 1928 (!) the famous "electronic musical instrument controlled without physical contact by the performer."

https://en.wikipedia.org/wiki/Theremin

[varjag]

He invented it earlier than that, as he personally demoed it to Lenin (who died in 1924).