Whatever happened to, say, Judge Crater? How did they build Stonehenge? Where did I leave my keys? Human bodies -- and all matter -- moving around emit gravitational radiation, as well as emit and reflect electromagnetic radiation, all of which is currently traveling out into space. Some of that radiation will pass near a black hole, get bent 180 degrees, and become observable on earth after a time delay, though it will require a ridiculously sensitive detector and possibly impossible signal processing to reconstruct the conditions generating the signal.
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