For me, the most interesting piece of future human technology in The Expanse is the ubiquitous "recycler". It's a mysterious contraption that you can throw basically anything into (food, utensils, clothing, guns) and it presumably "recycles" them. It works so efficiently that nobody seems to bother to clean or re-use most everyday items anymore. Dirty dishes? Throw 'em in the recycler. Skidmark in your underpants? Recycler. Need to get rid of a murder weapon? Recycler.
I don't bother wondering how any of the alien tech works, because it's meant to be incomprehensible... but I find myself spending a lot of time wondering how the hell the recycler works.
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