1. psychologie   chemistry   psychology   algebra   astronomy   Hint Half-n-half Clue   2. géométrie   calculus   physics   astronomy   geometry   Half-n-half Clue   3. chimie   chemistry   astronomy   calculus   geology   Half-n-half Clue   4. géographie   geography   algebra   philosophy   biology   Half-n-half Clue   5. géologie   geology   calculus   biology   zoology   Half-n-half Clue   6. trigonométrie   trigonometry   calculus   astronomy   chemistry   Half-n-half Clue   7. biologie   calculus   zoology   biology   algebra   Half-n-half Clue