Opinion | The Tampon of the Future (Published 2016)IS it possible to extract blood from people without causing pain? For decades, this problem has stumped the medical industry. In an effort to replace the old-fashioned needle, companies are trying to deploy laser beams and tiny vacuums to draw blood. In 2014, an engineer at Harvard named Ridhi Tariyal hit on a far simpler workaround. “I was trying to develop a way for women to monitor their own fe
