솜털처럼 가벼운 금속이 있다? / Ytn 사이언스
Synopsis
금속이 솜털처럼 가볍다?도저히 믿기지 않는데, 내구성은 일반 금속보다 더 강하다고 한다과연 어떻게 된 것인지 알아본다.
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