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* [[https://patents.google.com/patent/US20190287687A1/en| Co-60 Breeding Reactor Tandem with Thermionic Avalanche Cell]] | * [[https://patents.google.com/patent/US20190287687A1/en| Co-60 Breeding Reactor Tandem with Thermionic Avalanche Cell]] | ||
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+ | [[https://youtu.be/kN1JcBeXNuo|지구로 오는 행성 크기의 물체에 대한 NASA 의 해명 20/2/24]] |