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A few years ago I was hiking in the Alps. At a refuge
where we spent the night there was a very long steel
cable for hauling goods up from the valley. It was a
single span, goodness knows how long. I couldn't resist
whacking it with a piece of firewood from a stack nearby.
The pulse came back from the valley after what seemed
like a very long time. The interesting part is that for
a few seconds before the main pulse arrived the cable
sang with high frequency noise.