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In this activity, learners discover that some things only stand up while they are spinning.

Make impact craters with marbles (or rocks or washers) in a container of flour. Find out what you can learn about your "comets" by the craters they make.

In this activity, learners explore force and motion by constructing cardboard cars that are propelled by balloons.

In this design challenge, learners will create their own roller coaster using household objects for the track and a marble or small ball as their cart.