For one week each year, teacher Zach Carey turns his eighth-grade classroom into a working biology lab.

Students at Commodore John Rogers School in Baltimore, Maryland, walk into class on a Monday and find their room transformed. Two high-powered microscopes sit at the back of the class, and each group of desks is topped with a transparent tank occupied by two small, delicate fish: one male, one female.

For the next week, these kids will be scientists, and the fish are going to help them.

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