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"Tufts grads have developed the prototype for a conservation-minded shower head with a LED interface that fades from green to red when oblivious users start to enter water-wasting territory."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mnn.com/your-home/at-home/blogs/suds-with-a-side-of-guilt-shower-head-turns-red-when-youre-dawdling?hpt=hp_bn18>