Health and hygiene is an essential part of our everyday life. Someone rightly quoted it that ‘Cleanliness next to Godliness’. Cleanliness imperativein all human communities. In fact, a healthy mind resides in body. Entailing the last statement, World Organization (WHO,2006) defined health as “A state complete physical, mental, social well-being not merely absence disease or infirmity. It isan a...

This paper develops the formal aspects of a new apporach to reasoning about the knowledge of other agents. It is based on the principles of introspection, by which an agent is aware of the inferences he makes, and projection, by which an agent assumes that other agents have the same inference abilities as himself. The paper develops a logic that incorporates these principles and proves the soun...