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• #### Maths Mansion: Rotation

Sad man teaches us what happens to each vertice of a shape when rotating. Bad man does practice rounds to test the children on rotation. A special song is also sung to get the idea flowing.

• #### Beakman's World: Rotation Speed

Lester and Phoebe have a contest to see who can rotate an apparatus the fastest. The two apparatuses weigh exactly the same, but Phoebe wins because the weights on hers are closer to the middle. This demonstration explains how figure skaters can spin faster when they pull their arms and legs inward.

• #### Maths Mansion: Rotation in Practice

Bad man tests the children on their rotation skills to gain a card to escape the mansion.

• #### Beakman's World: Tightropes and Inertia

Beakman uses someone walking on a tightrope with a long pole to explain rotational inertia and shows a demo of walking with and without a long pole.

• #### Bill Nye, the Science Guy: Time-keeping Motion Machine of Science

Bill explains how we measure time and mentions some of the tools we use to measure it. He notes that time measurements, such as days, months, and years, are based on astronomical events and uses a motion machine to illustrate the Earth's revolution around the Sun and the Moon's revolution around the Earth.