I saw this posted at Wirecutter’s.
I grew up with the audiobooks of James Herriot’s All Creatures Great and Small series, narrated by Christopher Timothy, who played James Herriot MRCVS in the BBC series (which I also love).
A few times n the book series, James mentions having to put down an animal with a humane killer. I never knew that was a specific device until I saw this video.
I found this extremely interesting because it answered a question from my childhood that I never knew I had.
Apparently your childhood lacked a copy of W W Greener’s The Gun and its Development, which I found in the library in high school.
Dick Francis wrote a book in which a humane killer played a significant role. I think it was called “Bolt”