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Apple has marketed its Watch for years as a tool to monitor and improve your health — and is working on a growing number of research projects to prove the device’s medical applications can be useful in both people’s everyday lives and in clinical contexts.

Across the board, part of what makes Apple’s devices compelling for health is the company’s reach: millions of people are using its phones and watches every day. If Apple can figure out a way to nudge behavior in a positive direction or reliably monitor for disease symptoms, its potential impact at a population level is enormous.

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