Could wireless detection devices replace wearables?

These days there's perhaps no hotter tech topic than wearable sensors. Earlier this month, for instance, Apple announced a new "Health Kit" app for smartphones that tracks a person's health. But events such as Fitbit's recent recall of more than 1 million fitness bands over user skin irritations—and research published last week contending that health-trackers may be no more effective than a $25 pedometer—suggest that wearables have their drawbacks.

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