十万个为什么·科学阅读30篇（3）
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How Do Magnets Stick to Some Metals?
磁铁为什么能吸住某些金属？
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Magnets have two ends: north and south poles.
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They create an invisible force field around them.
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Only iron, nickel, and cobalt feel this pull.
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These metals have tiny magnetic parts inside.
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The magnet lines up those parts and pulls them.
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Two north poles push each other away.
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North and south poles always attract.
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Not all metals stick — aluminum and copper do not.