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Members of the most powerful drug gang in Brazil killed 31 inmates in a penitentiary on Friday, decapitating and cutting off the hearts of most of them, to take revenge for a separate massacre that left 56 dead this week.

Researchers from the Biosciences Institute of Botucatu, Brazil, has found that banana peel can be used to pull heavy metals that contaminate the water. "Not only that. Its performance was better than other techniques," said Gustavo Castro, researchers from the Biosciences Institute.

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