We live in a changing world, besides progressive, modern, new things, that also bring a lot of drawbacks to people, including new epidemics, and diseases. Therefore, humans always research, develop, and test new medicines, and other products, and animals are one of the experimental samples. Many people argue that these experiments should be prohibited, while others advocate them as they are useful for humans. I always believe that research is extremely necessary, but we should find out a new sample to replace animals in experiments.