1. Why do stars shine? Every time we see the stars on the backlight, they will shine. 3. Why does the photodetector emit light? Because they have a light emitter at the end of their abdomen. The luminous body is filled with fluorescent powder and luminescent enzyme, which makes the menu shine. Put on clothes, in addition to lighting, there are courtship, warning, trapping and other purposes. This is also a communication tool for them. Different brands of fireflies glow in different ways, frequencies and colors. Send different messages. 4. Why is the squirrel's tail so big? When the squirrel jumps into the tree, its tail plays a great role. It can keep the squirrel balanced when jumping on the tree and avoid falling and being injured. In addition, this big tail can play a more protective role in winter, tightly surrounding the squirrel's body, which is convenient and practical. 5. Why did jiaozi go up and down? The first question we want to talk about is, why did jiaozi sink to the bottom when it was done well, and then slowly began to rise after it was put down? This is mainly because when our jiaozi just put down the pot, its tail had an inarticulate sound. The air in his body is cooler, so he will be heavier in such cold. Generally speaking, the total density of cold air plus jiaozi will be heavier than our water. Jiaozi is ripe, but he will get up. 6. Why is the sky blue? With the strengthening of air control in China, our blue sky began to return to our provinces and cities. Many times, as long as the weather is good, we can see the blue sky. Blue sky is the most beautiful, so have you ever wondered why my sky is blue and not other colors? In fact, because our atmosphere has a certain barrier to our solar light, our blue light is the most thorough, which makes the most color coming down from the sky blue.