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Learners design, build, and test models of "dragon boats" made from up to three milk cartons.

Learners work in groups to construct bridges using stale marshmallows and toothpicks.

In this crafty chemistry activity (on page 2 of the PDF), learners make their own paper from used paper they may have otherwise thrown away.

Learners build a filter from old soda bottles and dirt. They create polluted water, and pour it through their filter to clean it.