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This video about ex-Soviet RTGs of questionable radioactive source choice is quite a good watch
https://www.youtube.com/watch?v=NT8-b5YEyjo
NASA apparently used RTGs for deep space missions only, while in the same timeframe the Soviets scattered them all across the countryside, then promptly forgot about them.
I too have an oddly specific one of these, which is tartare sauce.
I actively dislike all three of mayonnaise, gherkins, and capers. Mix 'em together though? Brilliant.