"A group of scientists from Brazil have discovered that minced Banana peels rather quickly and efficiently removed toxic metals from wastewater. In fact the method was found to be more effective than conventional water treatment plans. Moreover the same bunch of peels can be used up to 11 times....The results obtained showed that Banana peel was 20 times more effective than other substances."
Very cool. And the best part, banana peels are readily available and can be used in small scale operations where large commercial treatment centers are not present.