RUTGERS UNIVERSITY IMAGE: ENGINEERS CONDUCTED EXPERIMENTS WITH “DUMB ” HEADPHONES WITH ESTIMATED PRICES RANGING FROM $2.99 TO $15,000. HEADFI CAN TRANSFORM SUCH HEADPHONES INTO SMART ONES. CREDIT: XIAORAN FAN How do you turn “dumb” headphones into smart ones? Rutgers engineers have invented a cheap and easy way by transforming headphones into sensors that can be...