Innovation of the week: Shots that don't hurt

From The Idea Factory, our special report on innovation

 Comfortably Numb

From squeamish toddlers to muscle-bound tough guys, nobody likes getting a shot, said Michael Franco at CNET.com. Now a team of freshmen at Rice University have developed a gadget that "might bring relief" to the procedure. The device, dubbed Comfortably Numb and made using a 3-D printer, combines water and ammonium nitrate — the same ingredients found in instant ice packs — to cool injection sites and make needle pricks less painful.

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