Since I was born, what I hate most is rats, because rats not only eat food, but also sometimes gnaw furniture into craters, making the furniture very ugly.

It is relatively easy to understand that rats love to eat food. But why do rats chew the wood off furniture? Is wood also a delicacy for mice? In order to understand why rats like to chew wood, I checked out "One Hundred Thousand Whys" and also searched for relevant web pages online.

It turns out that rats do not eat wood as a delicacy, but because their teeth are different from those of other animals. The teeth of other animals stop growing after a certain point. Rats are different. Rats' teeth grow throughout their lives. If you don't find something to grind off the extra teeth, the teeth will grow longer and longer. So you have to find wood to grind off the extra teeth. However, rats will occasionally Find something else hard to grind your teeth with, such as soap.

In order to verify this statement in the book, I went to my father’s hospital to retrieve a white mouse for experimental use. I kept the white mouse in a cage and gave it plenty of food every day, but I didn't have any tools for the white mouse to grind its teeth. After some time, I found that the mice became more and more restless and would bite the cage from time to time. Finally, the mice had more and more food left. After a few days, I saw that the white mouse's teeth had grown a lot.

Through this experiment, I understood: It turns out that there are still so many mysteries in nature waiting for us to explore and discover.