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Shanza Sami, 14, is taking on air pollution in a powerful way. She's developed an extension for catalytic converters designed to reduce emissions from vehicles that run on fossil fuels

United statesPatrick zimmermanAshley cain gribbleKaty swalwellTimothy leducJen loebMount everestShanza samiAerospace solutions divisionWorld team trophy championUs pairs national championUs pairs national champion timothy leducAmazing iowa athletesNational champion timothy leducYoung scientistGlobal automotive