Problems with the Natural Sciences There are many problems and/or fallacies with the natural sciences; among them are observation, experiments and measurements. Many of the natural sciences are based on the observation of patterns. This soon establishes theories, even so there are always exceptions, and there is always something to prove a theory not entirely correct. Scientists can be biased when making observations, choosing to see only what they wish were there. As well as measurements not being exact, there is always a margin of error which proves that natural sciences are not always entirely precise. So we cannot be 100 percent sure of anything, even though it is previously established by scientifical laws. Certain studies or experiments can also be biased in part of the scientists; they may deny seeing something or just choose a theory that will go along with the experiment. There are loopholes in every science, natural sciences included.