Inspired by a scene from a "Mission Impossible" movie, scientist Lee Seok Woo developed an ultra-thin battery → for smart contact lenses that can be charged by tears.
The thickness of our battery is about 0.2 mm, which is about twice the thickness of a human hair,Lee said.
If you cry more, then you can charge your battery more.
The battery is still under development, but holds potential for applications in healthcare and wearable technology.
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