Animal testing has led to the development of vaccines and cures that save human lives, such as treatments for diseases like polio, measles, and cancer. However, hundreds of thousands of animals are killed or harmed each year in testing for cosmetics, household products, and other goods. While some argue animal testing benefits humans and other animals through medical advances, others believe it is unethical to cause harm or death to animals for product testing. There is ongoing debate around how much animal testing is necessary and humane.