CHICAGO (CBS) — The 66th annual Chicago Public Schools Science Fair was held at the Museum of Science and Industry Sunday.

Four students were awarded an all-expenses paid trip to the international science fair in Phoenix Arizona.

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Among them 16-year-old Daniel Puczko for his project the effect of mixed cultures on a microbial fuel cell.

Puczko says he focused on using e coli bacteria to create energy and he’s excited that he made it to the international science fair this year.

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Meantime, 50 students were chosen to head to the state science fair competition in Decatur in MAy. They are all receiving an all expense paid trip.

Among them is 15-year-old Veronica Garklavs, a sophomore at Whitney Young.

Her project measured whether organic or commercial fire retardants worked better.

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Garklavs says she’d love to see more girls involved in STEM.