1. géométrie   philosophy   history   geometry   zoology   Hint Half-n-half Clue   2. biologie   biology   geography   botany   philosophy   Half-n-half Clue   3. algèbre   geometry   calculus   algebra   botany   Half-n-half Clue   4. histoire   history   geography   biology   physics   Half-n-half Clue   5. astronomie   trigonometry   calculus   astronomy   psychology   Half-n-half Clue   6. philosophie   geography   history   botany   philosophy   Half-n-half Clue   7. trigonométrie   algebra   geometry   physics   trigonometry   Half-n-half Clue