Your body, the battery: Powering gadgets from human “biofuel”

If our bodies burn 2,000-2,500 calories per day anyway, that could power a smartphone. Technology has always been intimately linked to the human body. From sharpened flint to smartphones, we've been carrying our inventions for millennia—but the relationship is about to get even closer. The next generation of electronic devices might not just be near our bodies, they could be powered by them.
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