Throughout history, animals have been used in experiments to test the safety of products and gain medical knowledge that benefit both humans and animals. Every year, many medical advances are made, such as drugs and surgical instruments, which are tested on animals to ensure their safety before being deemed acceptable for human use. Even though the results of the experiments saved millions of human lives, they also killed millions of innocent animals. The use of animals for scientific experimentation is unnecessary because countless animals are subjected to painful procedures in order to benefit human life when there are known alternative methods to achieve the same experimental results. Animal testing is not a modern research method; Aristotle was one of the first to use living animals in his research (Thomassen 2). During his time, religion played a main role in society, making people believe that they were the supreme rulers of all other living things on earth, as the Bible says. As a result, humans and animals were not related and research was conducted solely to learn about non-human species. It was not until 1859, when Charles Darwin proposed his theory of evolution, that human and animal body systems were connected (Thomassen 2). Darwin's theory aroused the interest of many scientists and initiated the revolution in medical research. Through the use of animals for medical research over the past two centuries, scientists have been able to create vaccines and drugs, find innovative surgical methods, and manufacture medical equipment used to save lives. Without animal experimentation, the medical world would not be as... middle of article ......ive To Animal Experiments In Medical Research. " The British Medical Journal 1.5907 (nd): JSTOR SRU gateway. Web. December 6, 2011. Thomassen, Marte et al. “Animal testing in medical research: past, present and future”. nt.ntnu.no. Norges Teknisk-Naturvitenskapelige Web November 28, 2011. Animal testing." AAVS.org. American Anti-Vivisection Society, 2011. Web. December 6, 2011. United States. United States Department of Agriculture. Public Law 89-544. Government Printing Office, 2009. Print. “Questions and Answers About Biomedical Research.” humanesociety.org. The Humane Society of the United States, 2011. Web. December 6, 2011. Zurlo, Joanna, Deborah Rudacille and Alan Goldberg. “The three Rs: the way forward.” Environmental Health Perspectives 8th ed. Flight. 104. CAAT.JHSPH.EDU Johns Hopkins School of Public Health.. 2011.