1. géologie   geology   trigonometry   history   astronomy   Hint Half-n-half Clue   2. astronomie   trigonometry   calculus   history   astronomy   Half-n-half Clue   3. physique   chemistry   calculus   physics   psychology   Half-n-half Clue   4. psychologie   psychology   philosophy   geography   botany   Half-n-half Clue   5. algèbre   chemistry   algebra   geology   biology   Half-n-half Clue   6. géométrie   geology   geometry   physics   philosophy   Half-n-half Clue   7. philosophie   biology   zoology   geology   philosophy   Half-n-half Clue