One hundred years or so is about a lifespan of a person, but in technological terms it’s enough to turn the world into something practically unrecognizable. Still, there are the odd technological survivors (books, for instance) that drift through history for much longer than that mostly unchanged.
Tell us in the comments what your pick is for the oldest technologies that people are still using in (more or less) their original form. Be sure to include just how old the technology is and what your prognosis is for how long we can expect it to last in the future.
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