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Traditional batteries are nasty. The chemicals used in batteries can pose hazards to health, safety, and the environment. A few researchers have built batteries powered by things like sugar, and even many high school students have built simple batteries out of a potato, but these are far from practical. Let's face it: most people aren't excited at the thought of trying to stuff a potato into their smart phone. But thanks to new research by Pirbadian et al., there may be a new option on the horizon: batteries powered by bacteria.