1. Astronomie   astronomy   calculus   psychology   trigonometry   Hint Half-n-half Clue   2. Geometrie   botany   chemistry   history   geometry   Half-n-half Clue   3. Physik   astronomy   algebra   physics   botany   Half-n-half Clue   4. Psychologie   psychology   zoology   biology   geography   Half-n-half Clue   5. Geschichte   trigonometry   botany   history   physics   Half-n-half Clue   6. Chemie   chemistry   geometry   history   astronomy   Half-n-half Clue   7. Erdkunde   geography   botany   history   zoology   Half-n-half Clue