Phil Stephens, pioneer of an in vitro test for ulcer treatment based on genetic manipulation, says: “Scientists always want a better model for their experiments so to get better results, more accurate results. If a non-animal method can work better than an animal method, great. Not only does it give better results, but it is also much cheaper” (qtd. in Speaking of Research). In other words, scientists don't like the fact that they have to test animals, but they have no other choice. To put it another way, animals have shorter life cycles than humans, giving researchers an opportunity to exploit their entire lifespan. This helps the scientist to know the results of the treatment. In order for a scientist to find treatments that work, he or she must know the cause of the disease and the effects it can have on the human body. However, both supporters and critics of animal testing will likely argue that animal testing is unnecessary