The issue focused attention on one of the most difficult problems for scientists and scientists in general: producing findings that are compelling but also relevant to humans and society. Scientists have tried to do this by developing technologies that focus scientists' study of natural phenomena on certain biological and physiological aspects, such as living organisms and cells and tissues, and also scientific techniques that investigate what humans have learned about those organisms from experiments and observations. Scientists developed a particularly flexible way to do this by using experiments as the starting point, instead of relying on