Four seniors at Tufts designed a light-up shower head called Uji that turns from green to red over eight minutes, reminding you you’re taking too long. Sam Woolf, Brett Andler, Tyler Wilson, and Joo Kang originally intended to sell it for $50 to the eco-friendly crowd interested in saving water, says Woolf, but it may also have an audience of parents whose teenagers spend too long in the shower.
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