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Okay, on page FTC, what makes machine work? We have the energy. We have different types of energy. One of them, human energy, for example, to move a bike. Okay, to move a bike, we need someone to move the pedals. Okay, that is human energy. We need a person to move that.

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The human energy is the human energy.

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Uh-huh.

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We have also the electricity.

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The electricity.

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The air gives us energy.

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Yes, but this is another one.

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Electricity.

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Electricity, for example, to move the train.

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The train works with electricity.

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The computer works with electricity, the TV works with electricity, the smartphone, yes, the tablet, yeah, all that works with electricity.

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We also have the sunlight.

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Sunlight.

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From the sunlight we can get energy.

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The wind. We also have the wind for example. We have a person here. We have a paraglider.

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For this, you need a wheel also to move a boat with a sail.

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This kind of boat works with a wheel, okay?

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And the last one.

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Pedro.

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The Pedro.

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What means a car?

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What means a car?

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The car.

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The car.

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The gasoline.

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For example, the car, the lorry, the motorbike, they work with petrol.

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The motorbike is the motor.

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Yes. So we have this kind of energy, we have human energy, electricity, sunlight, wind, and petrol.