“For a smart material to be able to send out a more complex signal it needs to be nonlinear. If you hit a tuning fork twice as hard it will ring twice as loud but still at the same frequency. That's a linear response. If you hit a person twice as hard they're unlikely just to shout twice as loud. That property lets you learn more about the person than the tuning fork.
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"Neil Gershenfeld Quotes." Quotes.net. STANDS4 LLC, 2013. Web. 19 May 2013. <http://www.quotes.net/quote/4924>.

