Animals have been used to learn more about the human body since approximately 500 BC. Aristotle practiced vivisections, dissecting living animals, in order to understand how human bodies worked (Should). The ethicality of animal testing has recently become a very controversial issue in America. The US federally regulates animal testing with the Animal Welfare Act (AWA), which was passed in 1966 (Should). Testing chemicals on animals has allowed new medical discoveries to be made. Is it ethical for humans to test products on animals in order to advance their own scientific knowledge? A main argument against animal testing is that it is inhumane to treat animals without regard to any pain they may feel. Peter Singer, in his book Animal Liberation,
