In order to test some PMTs at liquid nitrogen temperature (77 Kelvin), my students are designing some Printed Circuit Board (PCB) to apply high voltage to the PMTs. However, whether PCBs work at that low temperature is a question. To find it out, they dumped an old PCB to liquid nitrogen several times and checked all pins, lines and soldering points and did not find anything wrong. Indeed, this board works at 77 Kelvin!
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