The history of cancer research has shown how scientists have used the basic steps of the scientific method to make new discoveries and advances in the understanding of cancer, cancer treatment and cancer cures. Watch the clips below about scientists Dr. Sidney Farber, Dr. Bernard Fisher, and Dr. Robert Weinberg, and identify and discuss the steps they took to make their discoveries. What was the problem they were trying to solve? What evidence did they have? What kind of experiments did they conduct? What conclusions did they draw from their experiments? Were they able to replicate their experiments?