The advent of inexpensive wearable sensors that can monitor heart rate and body temperature, as well as levels of blood sugar and metabolic byproducts, has allowed researchers and health professionals to monitor human health in ways never before possible. But like all electronic devices, these wearable sensors need a source of power. Batteries are an option, but are not necessarily ideal because they can be bulky, heavy, and run out of charge.
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Source: Phys.org