十万个为什么·科学阅读30篇（3）
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Why Do Fireflies Light Up at Night?
萤火虫为什么在夜晚发光？
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Fireflies make light through a chemical reaction.
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Two chemicals mix inside their bodies to create cold light.
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No heat is produced—unlike light bulbs.
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Each species has its own flash pattern and rhythm.
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Males flash to find mates; females answer back.
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Light helps them avoid predators too.
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They glow more on warm, humid summer nights.
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Scientists copy this chemistry for medical tools.