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That professor's statement was pretty silly.

Burning electronics does have a strong, distinct odor. If they are unfamiliar with that, its totally plausible that's all that they smelled.

Refrigerators are a few PCBs, a heat pump, a closed loop refrigerant, and a cooler. There really isn't anything especially exotic there.




Lead solder perhaps?


Lead solder hardly smells at all, and if it does, it's more likely to be the flux that smells and gives you cancer.


Hasn't that been banned for decades because of rohs?


What about it?




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