When I saw the headline "talking paper made by scientists", I thought it was talking about a wall-sized talking tape, but it turns out they're really figuring out this printable electronics process that's been talked about, but hasn't been put into practical uses quite yet. But...back to my original thought -- take a large cardboard sheet, printed with a billboardy advertisement, with a strip of plastic ridges demarked down one edge of the sign, encoded with an audio message. Instructions would encourage passers-by to run their fingernail down the board, activating the message, which is amplified by the size of the cardboard sheet. I think MY idea is cheaper, requires no electricity, and will be less prone to catastrophic failure (not working at all).
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