Profzang
Junhong Zhang, a professor at the University of Arizona, has spent three years working with fly ash, a waste product from coal-burning power plants. (Photo by Courtney Kock/Cronkite News)
Junhong Zhang, a professor at the University of Arizona, has spent three years working with fly ash, a waste product from coal-burning power plants. (Photo by Courtney Kock/Cronkite News)
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