1. Philosophie   calculus   psychology   zoology   philosophy   Hint Half-n-half Clue   2. Trigonometrie   zoology   psychology   algebra   trigonometry   Half-n-half Clue   3. Chemie   chemistry   calculus   physics   trigonometry   Half-n-half Clue   4. Zoologie   zoology   astronomy   geology   physics   Half-n-half Clue   5. Geschichte   history   biology   chemistry   zoology   Half-n-half Clue   6. Infinitesmalrechnung   algebra   calculus   astronomy   geology   Half-n-half Clue   7. Geologie   astronomy   psychology   calculus   geology   Half-n-half Clue