Technologies that Have Exceeded Their Expectations?
drfunch asks: "With the recent 'passing' of Pioneer 10 after over 30 years of service, I wonder what other technologies have far exceeded expectations. One example from my own experience is my trusty HP calculator, which is still going strong after 21 years. What technologies or devices have gone far beyond your expectations?"
So with that in mind, I nominate the Great Wall of China, still standing after all these years. I think it qualifies whereas things like the Pyramids don't, in that they never served any real function. I bet the wall would still work pretty well today, if there was a war. Not perfect, but good.
If the goal was to pick classes of technologies, I think most of the responses here are exceptionally shortsighted. I think sail technology, the steam engine and the wheel had a lot more staying power, and who knew?
I think there are some good specific examples. Any real old bridges out there? Panama Canal is great, 'course it was designed to last a long time. I bet there are some irrigation ditches somewhere that were dug thousands of years ago, and still work. Stepped hillsides fall into that category, too. Most people who built them probably paid no heed to them lasting longer.
Pioneer is unique, because there was really no way to maintain it, and it was a 1 (or 2) shot deal. Those HP calcs are fine, but have more than 10% lasted this long? I'd love t hear about some scarecrow that's been scaring away crows for 200 years without a person laying his hands on it. What's the longest any manufactured item has lasted (and remained useful) for without human intervention? Kudos to the winner.