Falsifiable - capable of being tested (verified or falsified) by experiment or observation. [1] It is a main part of the scientific method. The importance of falsifiability in science was first suggested by philosopher, Karl Popper. This is the prime test for whether a proposition or theory can be described as scientific. Paradoxically,that which is falsifiable, but has not yet been shown to be false, is accepted as scientific; that which is not falsifiable is not accepted as scientific in some quarters. Until the twentieth century Newton's laws of motion were