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Electric eel inspires biocompatible hydrogel battery: theengineer.co.uk/electric-eel
(based on paper at nature.com/articles/nature2467; see also news.umich.edu/electricity-eel)

The part that caught my attention is that they're using a Miura fold to simultaneously align and press together many pairs of droplets of four types (salty, fresh water, or two kinds of charge-selective hydrogel), creating an origami-activated electrical discharge.

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