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The vibrations that noise (including speech) produces on nearby objects (like a bag of chips or a plant's leaves) can be picked up by a high-speed camera and "read" by a computer with startling accuracy (story, video):
http://www.washingtonpost.com/news/speaking-of-science/wp/2014/08/04/mit-researchers-can-listen-to-your-conversation-by-watching-your-potato-chip-bag/?hpid=z4
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