Until the first part of the 20th century, health was defined as the absence of disease and was measured in terms of morbidity and mortality. This simple definition of health was rejected in 1948 with the expansion of the concept of health by the World Health Organization (WHO), defining it as “a state …

The human memory has an associative nature. Association and mental visualization combine skills and structures of the left and right brain halves. It is easier to remember pictures, photographs or drawings than words or sentences. In fact, it usually takes a lot of effort to remember words and sentences …