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Arika: Minnesota student Arika Kundu, 13, designed a method that turns peanut-shell waste into a material for removing pesticide residues from fresh produce; she is now competing for a $25,000 science...

A 13-year-old Indian-American student from Minnesota has invented a method to reduce pesticide residues on fresh fruits and vegetables by using peanut shells, something that is usually thrown away.

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