ANTONIO CONTRERAS
PEOPLE have always been made to believe that science is precise and exact. But nothing could be further from the truth. In fact, the growth of scientific knowledge has been characterized not by absolute truths, but by prevailing evidence. This evidence does not present itself as absolute, irrevocable and permanent claims, but within bodies of dominant concepts, theories, principles and methods, collectively labeled as paradigms, that are well-accepted at a given time. These paradigms govern what is referred to as a period of normal science.