Encender una bombilla con una papa

https://www.vix.com/es/btg/curiosidades/6198/un-sencillo-experimento-casero-como-encender-una-bombilla-con-una-papa

https://www.smithsonianmag.com/innovation/a-potato-battery-can-light-up-a-room-for-over-a-month-180948260/