FRAZEE, Minn. — On Tuesday morning, the sandy beach of Town Lake in Frazee was covered with what from a distance looked like litter.

A ninth grade science class at Frazee Senior High School had been tasked with building a fleet of boats with nothing more than cardboard and two rolls of duct tape.

A semester filled with lessons in buoyancy, buoyant forces and water displacement lead to Tuesday's race with the student-made armada — a chance to take the things learned in the classroom and apply them in the physical world.

"It's fun to take something that you do in class and apply it to some type of an activity that the kids really dive into — literally and figuratively — and just enjoy the day," said science teacher Tavia Bachmann. "It's a great way to end the school year."