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Machines Clocks | Gears |
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Clocks
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 The earliest clocks, and how they worked |
 A look at Galileo's experiments with pendulums |
 How a pendulum clock really works |
 What all the parts in a wind-up clock are for |
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Gears
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 How gears convert one kind of motion to another |
 The workings of a car's transmission |
 How gears work in bicycles. |
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