Researchers have come up with a tiny, micrometer-thin battery that can store energy from human tears to power smart contact lenses.
The new battery "relies on just glucose and water to generate electricity, both of which are safe to humans and would be less harmful to the environment when disposed, compared to conventional batteries," Woo added.
These two elements are also conveniently found in tears, which means the battery could be topped up using the natural resources of the human body.
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