copied:

This is curious new technology; imagine the US Flag being able to play the National Anthem from the flagpole! How scientists turned a flag into a loudspeaker MICHIGAN STATE UNIVERSITY EAST LANSING, Mich. – A paper-thin, flexible device created at Michigan State University not only can generate energy from human motion, it can act as […]

via New Tech: US flag could act as a speaker to play the National Anthem — Watts Up With That?

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