1. calcu   geometry   botany   zoology   calculus   Hint Half-n-half Clue   2. astronomie   calculus   biology   philosophy   astronomy   Half-n-half Clue   3. botanique   physics   geography   psychology   botany   Half-n-half Clue   4. physique   geography   physics   chemistry   botany   Half-n-half Clue   5. psychologie   physics   philosophy   biology   psychology   Half-n-half Clue   6. chimie   astronomy   chemistry   calculus   history   Half-n-half Clue   7. philosophie   history   philosophy   psychology   geography   Half-n-half Clue