^ailliere Tindall and Russell, 45s. the author points out, probably ^ore time and energy have been sPent over the past 100 years in e*ploring why some individuals are ^ntally defective than in investigating their training and treatment, 'his book provides a critical review present methods of educating training the mentally handi

The assessment of the prevalence of disease has been accepted as an integral part of the activities of public health. In order to assess such prevalence, tools for measuring the degree as well as the absence or presence become essential. One of the most common tools employed has been the disease-index. In dental public health, the absolute prevalence of malocclusion still remains unknown. Many ...

Species spanning the animal kingdom have evolved extravagant and costly ornaments to attract mating partners. Zahavi's handicap principle offers an elegant explanation for this: ornaments signal individual quality, and must be costly to ensure honest signalling, making mate selection more efficient. Here, we incorporate the assumptions of the handicap principle into a mathematical model and sho...