By pedaling the prison's stationary bikes, the inmates charge a battery that's used to power 10 street lamps along the town's riverside promenade. For every three eight-hour days they spend on the bikes, Silva and the voluntary program's other participants get one day shaved off their sentences.

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Brazil will offer inmates in its crowded federal penitentiary system a novel way to shorten their sentences: four days less for every book they read.

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