They say there's no use crying over spilled milk but it turns out tears can have a use after all; generating electricity.
Well more accurately an enzyme in tears, lysozyme, can be used to generate a tiny amount of electricity. Lysozyme is also found in saliva, mucus, egg whites, and milk, so spilled milk seems to be an untapped energy gold mine.
Researchers have been studying lysozyme for decades. Back in 1965, it was the second protein structure and first enzyme shape that was ever mapped out. But only recently was its electrical property discovered when researchers placed a film of lysozyme crystals between two plates of glass and squeezed.
Yep, that's all it took. Electricity from a squeeze. It's known as Piezoelectricity, and it's much more common than you might realize.
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