1. neurology   diseases   bacteria   nervous system with its functions and diseases   all life forms   Hint Half-n-half Clue   2. chemistry   viruses   antiquities   mathematics of pressures of liquids at rest   elements with their properties and reactions   Half-n-half Clue   3. graphology   criminals and crimes   handwriting and its analysis   fish   earth and its physical history   Half-n-half Clue