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"Learn how to safely open a D cell, and remove its sweet, sweet chemical innards. D cells are favorable as their large size facilitates investigation, and they contain the greatest magnitude of useable chemicals."

Plugging gadgets into a socket in the wall, or loading them with batteries - or maybe even unfurling a solar panel - is how most of us think of getting electricity. But what about plugging them into your body?

"You can power a digital clock with a few slices of oranges - but how many many oranges do you need to power an iPhone? "