波多黎各的海湾为何在夜晚发出蓝光？
Imagine you are in a small boat on a dark night. You put your hand in the water. The water around your hand turns bright blue! This is not magic. It is science. This happens in Mosquito Bay in Puerto Rico.
The blue light comes from tiny living things. They are called dinoflagellates. Each one is very small, like a dot. But there are millions of them in the water. When the water moves, they glow blue. It is like a natural night light.
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