I believe that animals should be used on medical research. I am not a cruel person. In fact, I love animals very much. However, when it comes to medical research, there has to be someone to be tested on, and animals are probably our best choice. Unless some human beings are willingly to be experimented on new technologies, our only choice left would be animal research until scientists find out how to clone a human being successfully. Perhaps it is a spiteful idea to test on animals, though sacrificing some animals to discover a new technology will benefit all humans in every way. I know the animals will forgive us and be happy if they knew their sacrifice was meaningful.