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The disaster I never imagined having to worry about
(i.ytimg.com)
General discussions about "science" itself
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Yes, it's gallium corroding aluminum or something like it, but the video is about pharmaceuticals.
It's just a visual analogy. Once aluminum is infiltrated by the gallium it can't be reverted, only removed/replaced.
Not only visual, it's the exact same thing: polymorphism. It's therefore an extremely relevant and fitting thumbnail, and chuckleslord is a fool for assuming otherwise without giving the video a shot.