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| Every material is made of extremely tiny pieces called atoms. |
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| Electricity can create special magnets wrapped around a regular piece of iron. |
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| Magnets can also encode information, or store it in a special code. |
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| Magnetism is an invisible force. |
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| All the electricity you use comes from machines called generators. |
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| Magnetism flows through space in lines of force. |
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| The first magnets were made of natural rock called lodestone. |
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| The invisible shape formed by the lines of force around the magnet is called magnetic field. |
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| The ends of a magnet are called magnetic poles. |
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| And all the electricity that runs these things comes from magnetism. |
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| The earth's iron core is magnetized. |
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| And electric motors work like generators in reverse. |
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| Two north poles will always repel each other. |
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