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Health care has come a long way since whole-body bloodletting. But medicine of the future will make even today’s broad-based therapies obsolete. Breakthroughs such as cancer-hunting nanoparticles, virus-busting lasers and featherweight heart monitors have begun to usher in a new era of targeted treatment—one in which drugs go directly where they’re needed, leaving healthy body tissues intact, and the slightest sign of illness is detected in real time.