萤火虫如何点亮夏夜：生物发光的奥秘
In a dark forest in the USA, summer nights are special. Tiny lights flash on and off among the trees. These are fireflies, also called lightning bugs. Every year, people come to the Great Smoky Mountains. They watch the glowing dance of these small insects.
Fireflies create light in their bodies. They mix oxygen with a natural chemical called luciferin. This reaction makes a cold, bright glow. There is no heat, like a light bulb. This trick is called bioluminescence. It helps fireflies find each other in the dark.
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