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Scientists have discovered a way to recover past sounds that have been embedded in walls:
Scientists have worked on the software and technology that can measure how each atom has been disturbed and match each unique disturbance with a unique word.
The technology virtually “replays” the sequence of words that have been spoken inside the walls. It’s like rewinding a tape recorder and you can go as far back in history as you want.
[btw, please note the date]