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What Neuralink is missing (it turns out that connecting brains with computers is the easy part)
(www.theatlantic.com)
This is a most excellent place for technology news and articles.
There are many different types of capacitors, most of which don't contain any liquid at all (including the most common type - ceramic capacitors).
But in general, you would use specially rated components and materials if you need them to last decades - not the cheapest most basic parts you can find.
Other types of implanted devices have dealt with the same things decades ago.