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In microgravity, everything gets everywhere. My mother worked on NASA funded research for diagnostic spit tests to determine chronic versus acute stress, which previously required blood draws, which are a less than optimal choice in space. It's all very stressful.

I was wondering about this as well. In theory, there are also some metals and compounds that react with each other with just simple contact which result in some kind of amalgamation which can result in disastrous structural loss. Veratassium recently did a video on this kind of effect[1]. Could this be happening here?

[1]: https://youtu.be/ksn5yrsC3Wg

Are you referring to galvanic corrosion? That's well understood and I'd hope not an issue in spacecraft manufacturing.

It seems as though the leaks are always in the Russian section? Perhaps this is why. Humans are the weak link. Damn breathers.

1980s Soviet metallurgy isnt known for corrosion resistance. Now the whole skin is made of that metal.

Don't forget the module we're talking about was built in the 80s originally intended for MIR 2. It's been in service since 2000.